We look at the division of 579928 by 20 
The aim is to understand the frequency of 20 in 579928.

On to step 1:
20 goes into 5 0 times with a remainder of 5.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 5, we end up with 5.
Take the next digit (7) from the dividend and append it to 5, then repeat: 57 / 20

Let's proceed to step 2:
57 divided by 20 is 2 with a remainder of 17.
The number 2 becomes the next digit in our result. 
Result so far: 2.0
Deduct 40 from 57 and we're left with 17.
Take the next digit (9) from the dividend and append it to 17, then repeat: 179 / 20

Moving on to step 3:
When dividing 179 by 20, we get 8 with a remainder of 19.
The next digit of our result is 8. 
Result so far: 28.0
The remainder is 19 after subtracting 160 from 179.
Include the next digit (9) from the dividend after 19, then repeat: 199 / 20

Step 4:
When dividing 199 by 20, we get 9 with a remainder of 19.
Record the quotient 9 as the next digit in the result. 
Result so far: 289.0
Deduct 180 from 199 and we're left with 19.
Bring next digit (2) of the dividend behind the 19 and repeat the process: 192 / 20

Advancing to step 5:
20 can be fit into 192 9 times, resulting in a remainder of 12.
Put 9 as the next digit of the answer. 
Result so far: 2899.0
If we subtract 180 from 192, we get 12.
Grab the next digit (8) from the dividend, add it to 12, then carry on: 128 / 20

Advancing to step 6:
128 divided by 20 is 6 with a remainder of 8.
Record the quotient 6 as the next digit in the result. 
Result so far: 28996.0
Subtract 120 from 128 to get 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Step 7:
80 divided by 20 is 4 with a remainder of 0.
Put 4 as the next digit of the answer. 
Result so far: 28996.4
Subtracting 80 from 80 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.

Moving on to step 8:
20 goes into 0 0 times with a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 28996.4
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.

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: 28996.4
Deduct 0 from 0 and we're left 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.

In conclusion, the division gives 28996.4 with a balance of 0.0.