We divide 861800 by 20
Let's see how many times 20 fits into 861800.

Going ahead to step 1:
When dividing 8 by 20, we get 0 with a remainder of 8.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 8, we get 8.
Take the next digit (6) from the dividend and append it to 8, then repeat: 86 / 20

On to step 2:
When dividing 86 by 20, we get 4 with a remainder of 6.
Write down 4 as next digit of the result. 
Result so far: 4.0
Subtracting 80 from 86 leaves us with 6.
Take the next digit (1) from the dividend and append it to 6, then repeat: 61 / 20

Moving on to step 3:
The number 20 fits into 61 3 times, leaving a remainder of 1.
Put 3 as the next digit of the answer. 
Result so far: 43.0
If we take 60 away from 61, we end up with 1.
Append the next digit (8) from the dividend to 1 and continue with: 18 / 20

Advancing to step 4:
If we divide 18 by 20, we get 0 and a remainder of 18.
Record the quotient 0 as the next digit in the result. 
Result so far: 430.0
Deduct 0 from 18 and we're left with 18.
Include the next digit (0) from the dividend after 18, then repeat: 180 / 20

Moving on to step 5:
If we divide 180 by 20, we get 9 and a remainder of 0.
Record the quotient 9 as the next digit in the result. 
Result so far: 4309.0
Subtract 180 from 180 to get 0.
Bring next digit (0) of the dividend behind the 0 and repeat the process: 0 / 20

Step 6:
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: 43090.0
If we take 0 away from 0, we end up 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.

Let's proceed to step 7:
20 can be fit into 0 0 times, resulting in a remainder of 0.
The next digit of our result is 0. 
Result so far: 43090.0
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.

Moving on to step 8:
0 divided by 20 is 0 with a remainder of 0.
The next digit of our result is 0. 
Result so far: 43090.0
Deduct 0 from 0 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.

The final result is 43090.0 with a remainder of 0.0.