We look at the division of 479408 by 20 
The aim is to understand the frequency of 20 in 479408.

Going ahead to step 1:
The number 20 fits into 4 0 times, leaving a remainder of 4.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 4 after subtracting 0 from 4.
Take the next digit (7) from the dividend and append it to 4, then repeat: 47 / 20

Let's proceed to step 2:
If we divide 47 by 20, we get 2 and a remainder of 7.
Use 2 as the next digit of our solution. 
Result so far: 2.0
If we subtract 40 from 47, we get 7.
Include the next digit (9) from the dividend after 7, then repeat: 79 / 20

Moving on to step 3:
If we divide 79 by 20, we get 3 and a remainder of 19.
The next digit of our result is 3. 
Result so far: 23.0
Subtracting 60 from 79 leaves us with 19.
Bring next digit (4) of the dividend behind the 19 and repeat the process: 194 / 20

Advancing to step 4:
If we divide 194 by 20, we get 9 and a remainder of 14.
Put 9 as the next digit of the answer. 
Result so far: 239.0
If we take 180 away from 194, we end up with 14.
Include the next digit (0) from the dividend after 14, then repeat: 140 / 20

On to step 5:
20 goes into 140 7 times with a remainder of 0.
The number 7 becomes the next digit in our result. 
Result so far: 2397.0
The remainder is 0 after subtracting 140 from 140.
Grab the next digit (8) from the dividend, add it to 0, then carry on: 8 / 20

Going ahead to step 6:
If we divide 8 by 20, we get 0 and a remainder of 8.
Record the quotient 0 as the next digit in the result. 
Result so far: 23970.0
The remainder is 8 after subtracting 0 from 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Advancing to step 7:
If we divide 80 by 20, we get 4 and a remainder of 0.
Write down 4 as next digit of the result. 
Result so far: 23970.4
Subtract 80 from 80 to 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.

Moving on to step 8:
20 goes into 0 0 times with a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 23970.4
Subtract 0 from 0 to 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.

Going ahead to step 9:
The number 20 fits into 0 0 times, leaving a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 23970.4
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.

Our division results in 23970.4 with a remaining 0.0.