420337 divided by 20 
Our goal is to divide 420337 by 20.

Going ahead to step 1:
20 can be fit into 4 0 times, resulting in a remainder of 4.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 4 and we're left with 4.
Bring next digit (2) of the dividend behind the 4 and repeat the process: 42 / 20

Step 2:
When dividing 42 by 20, we get 2 with a remainder of 2.
Write down 2 as next digit of the result. 
Result so far: 2.0
The remainder is 2 after subtracting 40 from 42.
Append the next digit (0) from the dividend to 2 and continue with: 20 / 20

Step 3:
The number 20 fits into 20 1 times, leaving a remainder of 0.
Write down 1 as next digit of the result. 
Result so far: 21.0
If we subtract 20 from 20, we get 0.
Bring next digit (3) of the dividend behind the 0 and repeat the process: 3 / 20

Let's proceed to step 4:
3 divided by 20 is 0 with a remainder of 3.
The number 0 becomes the next digit in our result. 
Result so far: 210.0
The remainder is 3 after subtracting 0 from 3.
Append the next digit (3) from the dividend to 3 and continue with: 33 / 20

Advancing to step 5:
33 divided by 20 is 1 with a remainder of 13.
Use 1 as the next digit of our solution. 
Result so far: 2101.0
Subtract 20 from 33 to get 13.
Grab the next digit (7) from the dividend, add it to 13, then carry on: 137 / 20

Going ahead to step 6:
20 goes into 137 6 times with a remainder of 17.
Record the quotient 6 as the next digit in the result. 
Result so far: 21016.0
If we subtract 120 from 137, we get 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Advancing to step 7:
20 can be fit into 170 8 times, resulting in a remainder of 10.
The number 8 becomes the next digit in our result. 
Result so far: 21016.8
Subtracting 160 from 170 leaves us with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Moving on to step 8:
The number 20 fits into 100 5 times, leaving a remainder of 0.
The next digit of our result is 5. 
Result so far: 21016.85
Deduct 100 from 100 and we're left with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Going ahead to step 9:
0 divided by 20 is 0 with a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 21016.85
The remainder is 0 after subtracting 0 from 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Step 10:
When dividing 0 by 20, we get 0 with a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 21016.85
Subtracting 0 from 0 leaves us with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

The final outcome is 21016.85, with a leftover of 0.0.