We look at the division of 521489 by 20 
We're looking to find how many times 20 goes into 521489.

On to step 1:
The number 20 fits into 5 0 times, leaving a remainder of 5.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 5 to get 5.
Include the next digit (2) from the dividend after 5, then repeat: 52 / 20

Going ahead to step 2:
If we divide 52 by 20, we get 2 and a remainder of 12.
The next digit of our result is 2. 
Result so far: 2.0
The remainder is 12 after subtracting 40 from 52.
Append the next digit (1) from the dividend to 12 and continue with: 121 / 20

Going ahead to step 3:
20 goes into 121 6 times with a remainder of 1.
Write down 6 as next digit of the result. 
Result so far: 26.0
Subtracting 120 from 121 leaves us with 1.
Bring next digit (4) of the dividend behind the 1 and repeat the process: 14 / 20

Going ahead to step 4:
14 divided by 20 is 0 with a remainder of 14.
The next digit of our result is 0. 
Result so far: 260.0
Subtracting 0 from 14 leaves us with 14.
Append the next digit (8) from the dividend to 14 and continue with: 148 / 20

On to step 5:
148 divided by 20 is 7 with a remainder of 8.
Record the quotient 7 as the next digit in the result. 
Result so far: 2607.0
Subtracting 140 from 148 leaves us with 8.
Fetch the next digit (9) from the dividend, attach it to 8 and continue: 89 / 20

Going ahead to step 6:
The number 20 fits into 89 4 times, leaving a remainder of 9.
The next digit of our result is 4. 
Result so far: 26074.0
Deduct 80 from 89 and we're left with 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Advancing to step 7:
20 goes into 90 4 times with a remainder of 10.
The next digit of our result is 4. 
Result so far: 26074.4
If we subtract 80 from 90, we get 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:
20 goes into 100 5 times with a remainder of 0.
Use 5 as the next digit of our solution. 
Result so far: 26074.45
Subtracting 100 from 100 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.

Going ahead to step 9:
20 goes into 0 0 times with a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 26074.45
If we subtract 0 from 0, 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.

Let's proceed to step 10:
20 goes into 0 0 times with a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 26074.45
The remainder is 0 after subtracting 0 from 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 outcome is 26074.45, with a leftover of 0.0.