We look at the division of 459515 by 20 
The aim is to understand the frequency of 20 in 459515.

Advancing to step 1:
The number 20 fits into 4 0 times, leaving a remainder of 4.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 4, we end up with 4.
Bring next digit (5) of the dividend behind the 4 and repeat the process: 45 / 20

Going ahead to step 2:
The number 20 fits into 45 2 times, leaving a remainder of 5.
Record the quotient 2 as the next digit in the result. 
Result so far: 2.0
Deduct 40 from 45 and we're left with 5.
Grab the next digit (9) from the dividend, add it to 5, then carry on: 59 / 20

Moving on to step 3:
20 can be fit into 59 2 times, resulting in a remainder of 19.
Use 2 as the next digit of our solution. 
Result so far: 22.0
The remainder is 19 after subtracting 40 from 59.
Fetch the next digit (5) from the dividend, attach it to 19 and continue: 195 / 20

Going ahead to step 4:
20 can be fit into 195 9 times, resulting in a remainder of 15.
Put 9 as the next digit of the answer. 
Result so far: 229.0
If we take 180 away from 195, we end up with 15.
Take the next digit (1) from the dividend and append it to 15, then repeat: 151 / 20

Moving on to step 5:
The number 20 fits into 151 7 times, leaving a remainder of 11.
Record the quotient 7 as the next digit in the result. 
Result so far: 2297.0
If we take 140 away from 151, we end up with 11.
Append the next digit (5) from the dividend to 11 and continue with: 115 / 20

Going ahead to step 6:
20 can be fit into 115 5 times, resulting in a remainder of 15.
Use 5 as the next digit of our solution. 
Result so far: 22975.0
Subtract 100 from 115 to get 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Going ahead to step 7:
20 can be fit into 150 7 times, resulting in a remainder of 10.
The next digit of our result is 7. 
Result so far: 22975.7
Subtracting 140 from 150 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.

Going ahead to step 8:
20 goes into 100 5 times with a remainder of 0.
The next digit of our result is 5. 
Result so far: 22975.75
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.

Step 9:
The number 20 fits into 0 0 times, leaving a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 22975.75
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.

Moving on to step 10:
0 divided by 20 is 0 with a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 22975.75
If we take 0 away from 0, we end up 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.

After the division, we end up with 22975.75 and a remainder of 0.0.