We look at the division of 843861 by 20 
We want to divide 843861 by 20.

Let's proceed to step 1:
The number 20 fits into 8 0 times, leaving a remainder of 8.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 8 to get 8.
Fetch the next digit (4) from the dividend, attach it to 8 and continue: 84 / 20

Moving on to step 2:
20 goes into 84 4 times with a remainder of 4.
Write down 4 as next digit of the result. 
Result so far: 4.0
Deduct 80 from 84 and we're left with 4.
Take the next digit (3) from the dividend and append it to 4, then repeat: 43 / 20

Going ahead to step 3:
If we divide 43 by 20, we get 2 and a remainder of 3.
The next digit of our result is 2. 
Result so far: 42.0
Subtracting 40 from 43 leaves us with 3.
Take the next digit (8) from the dividend and append it to 3, then repeat: 38 / 20

Advancing to step 4:
When dividing 38 by 20, we get 1 with a remainder of 18.
Use 1 as the next digit of our solution. 
Result so far: 421.0
If we subtract 20 from 38, we get 18.
Take the next digit (6) from the dividend and append it to 18, then repeat: 186 / 20

Let's proceed to step 5:
When dividing 186 by 20, we get 9 with a remainder of 6.
Use 9 as the next digit of our solution. 
Result so far: 4219.0
Deduct 180 from 186 and we're left with 6.
Take the next digit (1) from the dividend and append it to 6, then repeat: 61 / 20

Going ahead to step 6:
61 divided by 20 is 3 with a remainder of 1.
Write down 3 as next digit of the result. 
Result so far: 42193.0
Deduct 60 from 61 and we're left with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Going ahead to step 7:
If we divide 10 by 20, we get 0 and a remainder of 10.
Put 0 as the next digit of the answer. 
Result so far: 42193.0
Deduct 0 from 10 and we're left 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:
100 divided by 20 is 5 with a remainder of 0.
The next digit of our result is 5. 
Result so far: 42193.05
Subtract 100 from 100 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Advancing 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: 42193.05
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.

Step 10:
20 goes into 0 0 times with a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 42193.05
Subtract 0 from 0 to get 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 42193.05, with a leftover of 0.0.