We divide 660528 by 20
The aim is to understand the frequency of 20 in 660528.

On to step 1:
If we divide 6 by 20, we get 0 and a remainder of 6.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 6, we end up with 6.
Take the next digit (6) from the dividend and append it to 6, then repeat: 66 / 20

Moving on to step 2:
The number 20 fits into 66 3 times, leaving a remainder of 6.
Put 3 as the next digit of the answer. 
Result so far: 3.0
If we subtract 60 from 66, we get 6.
Take the next digit (0) from the dividend and append it to 6, then repeat: 60 / 20

On to step 3:
20 goes into 60 3 times with a remainder of 0.
Record the quotient 3 as the next digit in the result. 
Result so far: 33.0
Subtracting 60 from 60 leaves us with 0.
Append the next digit (5) from the dividend to 0 and continue with: 5 / 20

On to step 4:
5 divided by 20 is 0 with a remainder of 5.
Use 0 as the next digit of our solution. 
Result so far: 330.0
If we take 0 away from 5, we end up with 5.
Take the next digit (2) from the dividend and append it to 5, then repeat: 52 / 20

Moving on to step 5:
20 goes into 52 2 times with a remainder of 12.
Use 2 as the next digit of our solution. 
Result so far: 3302.0
Subtracting 40 from 52 leaves us with 12.
Grab the next digit (8) from the dividend, add it to 12, then carry on: 128 / 20

On to step 6:
20 can be fit into 128 6 times, resulting in a remainder of 8.
Put 6 as the next digit of the answer. 
Result so far: 33026.0
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.

Let's proceed to step 7:
When dividing 80 by 20, we get 4 with a remainder of 0.
The number 4 becomes the next digit in our result. 
Result so far: 33026.4
The remainder is 0 after subtracting 80 from 80.
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 8:
If we divide 0 by 20, we get 0 and a remainder of 0.
The next digit of our result is 0. 
Result so far: 33026.4
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.

Moving on to step 9:
20 can be fit into 0 0 times, resulting in a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 33026.4
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.

The quotient of the division is 33026.4, and the remainder is 0.0.