We look at the division of 20686837 by 42 
Let's see how many times 42 fits into 20686837.

Step 1:
If we divide 2 by 42, we get 0 and a remainder of 2.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 2 leaves us with 2.
Take the next digit (0) from the dividend and append it to 2, then repeat: 20 / 42

Moving on to step 2:
If we divide 20 by 42, we get 0 and a remainder of 20.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 20 and we're left with 20.
Fetch the next digit (6) from the dividend, attach it to 20 and continue: 206 / 42

Step 3:
42 can be fit into 206 4 times, resulting in a remainder of 38.
Write down 4 as next digit of the result. 
Result so far: 4.0
Deduct 168 from 206 and we're left with 38.
Fetch the next digit (8) from the dividend, attach it to 38 and continue: 388 / 42

Advancing to step 4:
The number 42 fits into 388 9 times, leaving a remainder of 10.
Use 9 as the next digit of our solution. 
Result so far: 49.0
If we subtract 378 from 388, we get 10.
Append the next digit (6) from the dividend to 10 and continue with: 106 / 42

Advancing to step 5:
42 can be fit into 106 2 times, resulting in a remainder of 22.
The next digit of our result is 2. 
Result so far: 492.0
Subtract 84 from 106 to get 22.
Bring next digit (8) of the dividend behind the 22 and repeat the process: 228 / 42

Let's proceed to step 6:
42 goes into 228 5 times with a remainder of 18.
Use 5 as the next digit of our solution. 
Result so far: 4925.0
Subtract 210 from 228 to get 18.
Include the next digit (3) from the dividend after 18, then repeat: 183 / 42

Moving on to step 7:
If we divide 183 by 42, we get 4 and a remainder of 15.
Use 4 as the next digit of our solution. 
Result so far: 49254.0
Subtracting 168 from 183 leaves us with 15.
Include the next digit (7) from the dividend after 15, then repeat: 157 / 42

Step 8:
When dividing 157 by 42, we get 3 with a remainder of 31.
Use 3 as the next digit of our solution. 
Result so far: 492543.0
If we take 126 away from 157, we end up with 31.
Since there are no more digits in the dividend, we add a zero to the remainder making it 310, and continue the process.

Step 9:
42 can be fit into 310 7 times, resulting in a remainder of 16.
The next digit of our result is 7. 
Result so far: 492543.7
If we take 294 away from 310, we end up with 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Moving on to step 10:
160 divided by 42 is 3 with a remainder of 34.
The number 3 becomes the next digit in our result. 
Result so far: 492543.73
Deduct 126 from 160 and we're left with 34.
Since there are no more digits in the dividend, we add a zero to the remainder making it 340, and continue the process.

Advancing to step 11:
340 divided by 42 is 8 with a remainder of 4.
Put 8 as the next digit of the answer. 
Result so far: 492543.738
The remainder is 4 after subtracting 336 from 340.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Moving on to step 12:
The number 42 fits into 40 0 times, leaving a remainder of 40.
Put 0 as the next digit of the answer. 
Result so far: 492543.738
Deduct 0 from 40 and we're left with 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Going ahead to step 13:
When dividing 400 by 42, we get 9 with a remainder of 22.
Use 9 as the next digit of our solution. 
Result so far: 492543.73809
Subtract 378 from 400 to get 22.
Since there are no more digits in the dividend, we add a zero to the remainder making it 220, and continue the process.

Going ahead to step 14:
220 divided by 42 is 5 with a remainder of 10.
Record the quotient 5 as the next digit in the result. 
Result so far: 492543.738095
The remainder is 10 after subtracting 210 from 220.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Going ahead to step 15:
The number 42 fits into 100 2 times, leaving a remainder of 16.
The number 2 becomes the next digit in our result. 
Result so far: 492543.7380952
The remainder is 16 after subtracting 84 from 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Let's proceed to step 16:
When dividing 160 by 42, we get 3 with a remainder of 34.
Record the quotient 3 as the next digit in the result. 
Result so far: 492543.73809523
Subtracting 126 from 160 leaves us with 34.
Since there are no more digits in the dividend, we add a zero to the remainder making it 340, and continue the process.

The final result is 492543.73809523 with a remainder of 3.4e-08.