We look at the division of 508571 by 20 
We're looking to find how many times 20 goes into 508571.

Moving on to step 1:
20 goes into 5 0 times with a remainder of 5.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 5 after subtracting 0 from 5.
Append the next digit (0) from the dividend to 5 and continue with: 50 / 20

Advancing to step 2:
20 goes into 50 2 times with a remainder of 10.
Write down 2 as next digit of the result. 
Result so far: 2.0
If we subtract 40 from 50, we get 10.
Take the next digit (8) from the dividend and append it to 10, then repeat: 108 / 20

On to step 3:
If we divide 108 by 20, we get 5 and a remainder of 8.
The next digit of our result is 5. 
Result so far: 25.0
Deduct 100 from 108 and we're left with 8.
Take the next digit (5) from the dividend and append it to 8, then repeat: 85 / 20

Advancing to step 4:
The number 20 fits into 85 4 times, leaving a remainder of 5.
Use 4 as the next digit of our solution. 
Result so far: 254.0
Subtracting 80 from 85 leaves us with 5.
Take the next digit (7) from the dividend and append it to 5, then repeat: 57 / 20

Moving on to step 5:
20 goes into 57 2 times with a remainder of 17.
Put 2 as the next digit of the answer. 
Result so far: 2542.0
If we subtract 40 from 57, we get 17.
Fetch the next digit (1) from the dividend, attach it to 17 and continue: 171 / 20

Step 6:
20 goes into 171 8 times with a remainder of 11.
Put 8 as the next digit of the answer. 
Result so far: 25428.0
The remainder is 11 after subtracting 160 from 171.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

On to step 7:
20 can be fit into 110 5 times, resulting in a remainder of 10.
Record the quotient 5 as the next digit in the result. 
Result so far: 25428.5
Subtracting 100 from 110 leaves us 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.

Let's proceed to step 8:
When dividing 100 by 20, we get 5 with a remainder of 0.
The next digit of our result is 5. 
Result so far: 25428.55
If we subtract 100 from 100, we 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.

Our division results in 25428.55 with a remaining 0.0.