Let's divide 812584 by 20
We're looking to find how many times 20 goes into 812584.

Moving on to step 1:
The number 20 fits into 8 0 times, leaving a remainder of 8.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 8 after subtracting 0 from 8.
Grab the next digit (1) from the dividend, add it to 8, then carry on: 81 / 20

Going ahead to step 2:
20 can be fit into 81 4 times, resulting in a remainder of 1.
Write down 4 as next digit of the result. 
Result so far: 4.0
The remainder is 1 after subtracting 80 from 81.
Grab the next digit (2) from the dividend, add it to 1, then carry on: 12 / 20

Moving on to step 3:
12 divided by 20 is 0 with a remainder of 12.
Record the quotient 0 as the next digit in the result. 
Result so far: 40.0
Subtract 0 from 12 to get 12.
Append the next digit (5) from the dividend to 12 and continue with: 125 / 20

Let's proceed to step 4:
125 divided by 20 is 6 with a remainder of 5.
The next digit of our result is 6. 
Result so far: 406.0
If we subtract 120 from 125, we get 5.
Include the next digit (8) from the dividend after 5, then repeat: 58 / 20

On to step 5:
58 divided by 20 is 2 with a remainder of 18.
Put 2 as the next digit of the answer. 
Result so far: 4062.0
Deduct 40 from 58 and we're left with 18.
Take the next digit (4) from the dividend and append it to 18, then repeat: 184 / 20

Going ahead to step 6:
If we divide 184 by 20, we get 9 and a remainder of 4.
Record the quotient 9 as the next digit in the result. 
Result so far: 40629.0
Subtract 180 from 184 to get 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Let's proceed to step 7:
40 divided by 20 is 2 with a remainder of 0.
Put 2 as the next digit of the answer. 
Result so far: 40629.2
If we take 40 away from 40, 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.

On to step 8:
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: 40629.2
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.

Moving on to step 9:
0 divided by 20 is 0 with a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 40629.2
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.

The final result is 40629.2 with a remainder of 0.0.