Let's divide 863580 by 20
Our goal is to divide 863580 by 20.

Step 1:
8 divided by 20 is 0 with a remainder of 8.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 8 and we're left with 8.
Fetch the next digit (6) from the dividend, attach it to 8 and continue: 86 / 20

Moving on to step 2:
The number 20 fits into 86 4 times, leaving a remainder of 6.
The number 4 becomes the next digit in our result. 
Result so far: 4.0
Deduct 80 from 86 and we're left with 6.
Append the next digit (3) from the dividend to 6 and continue with: 63 / 20

On to step 3:
If we divide 63 by 20, we get 3 and a remainder of 3.
Use 3 as the next digit of our solution. 
Result so far: 43.0
If we take 60 away from 63, we end up with 3.
Bring next digit (5) of the dividend behind the 3 and repeat the process: 35 / 20

On to step 4:
The number 20 fits into 35 1 times, leaving a remainder of 15.
Put 1 as the next digit of the answer. 
Result so far: 431.0
If we subtract 20 from 35, we get 15.
Bring next digit (8) of the dividend behind the 15 and repeat the process: 158 / 20

On to step 5:
If we divide 158 by 20, we get 7 and a remainder of 18.
Put 7 as the next digit of the answer. 
Result so far: 4317.0
Deduct 140 from 158 and we're left with 18.
Fetch the next digit (0) from the dividend, attach it to 18 and continue: 180 / 20

Advancing to step 6:
If we divide 180 by 20, we get 9 and a remainder of 0.
Put 9 as the next digit of the answer. 
Result so far: 43179.0
Subtract 180 from 180 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.

Step 7:
If we divide 0 by 20, we get 0 and a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 43179.0
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.

Step 8:
0 divided by 20 is 0 with a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 43179.0
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.

After the division, we end up with 43179.0 and a remainder of 0.0.