We look at the division of 871392 by 20 
We're looking to find how many times 20 goes into 871392.

Step 1:
8 divided by 20 is 0 with a remainder of 8.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 8 after subtracting 0 from 8.
Take the next digit (7) from the dividend and append it to 8, then repeat: 87 / 20

Advancing to step 2:
20 goes into 87 4 times with a remainder of 7.
Put 4 as the next digit of the answer. 
Result so far: 4.0
Subtract 80 from 87 to get 7.
Bring next digit (1) of the dividend behind the 7 and repeat the process: 71 / 20

Advancing to step 3:
20 goes into 71 3 times with a remainder of 11.
The next digit of our result is 3. 
Result so far: 43.0
Subtract 60 from 71 to get 11.
Append the next digit (3) from the dividend to 11 and continue with: 113 / 20

Moving on to step 4:
When dividing 113 by 20, we get 5 with a remainder of 13.
Write down 5 as next digit of the result. 
Result so far: 435.0
Subtracting 100 from 113 leaves us with 13.
Bring next digit (9) of the dividend behind the 13 and repeat the process: 139 / 20

On to step 5:
139 divided by 20 is 6 with a remainder of 19.
Write down 6 as next digit of the result. 
Result so far: 4356.0
The remainder is 19 after subtracting 120 from 139.
Grab the next digit (2) from the dividend, add it to 19, then carry on: 192 / 20

On to step 6:
When dividing 192 by 20, we get 9 with a remainder of 12.
Use 9 as the next digit of our solution. 
Result so far: 43569.0
Subtracting 180 from 192 leaves us with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Step 7:
20 goes into 120 6 times with a remainder of 0.
Put 6 as the next digit of the answer. 
Result so far: 43569.6
Subtract 120 from 120 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.

On to step 8:
20 goes into 0 0 times with a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 43569.6
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.

Going ahead to step 9:
0 divided by 20 is 0 with a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 43569.6
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.

After the division, we end up with 43569.6 and a remainder of 0.0.