Let's divide 636159 by 20
The aim is to understand the frequency of 20 in 636159.

Advancing to step 1:
If we divide 6 by 20, we get 0 and a remainder of 6.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 6 leaves us with 6.
Append the next digit (3) from the dividend to 6 and continue with: 63 / 20

On to step 2:
20 can be fit into 63 3 times, resulting in a remainder of 3.
Record the quotient 3 as the next digit in the result. 
Result so far: 3.0
The remainder is 3 after subtracting 60 from 63.
Take the next digit (6) from the dividend and append it to 3, then repeat: 36 / 20

Let's proceed to step 3:
20 goes into 36 1 times with a remainder of 16.
Use 1 as the next digit of our solution. 
Result so far: 31.0
The remainder is 16 after subtracting 20 from 36.
Append the next digit (1) from the dividend to 16 and continue with: 161 / 20

On to step 4:
If we divide 161 by 20, we get 8 and a remainder of 1.
The next digit of our result is 8. 
Result so far: 318.0
Deduct 160 from 161 and we're left with 1.
Bring next digit (5) of the dividend behind the 1 and repeat the process: 15 / 20

Let's proceed to step 5:
20 goes into 15 0 times with a remainder of 15.
Put 0 as the next digit of the answer. 
Result so far: 3180.0
If we subtract 0 from 15, we get 15.
Take the next digit (9) from the dividend and append it to 15, then repeat: 159 / 20

Advancing to step 6:
If we divide 159 by 20, we get 7 and a remainder of 19.
The number 7 becomes the next digit in our result. 
Result so far: 31807.0
Subtracting 140 from 159 leaves us with 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Advancing to step 7:
The number 20 fits into 190 9 times, leaving a remainder of 10.
Use 9 as the next digit of our solution. 
Result so far: 31807.9
The remainder is 10 after subtracting 180 from 190.
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 can be fit into 100 5 times, resulting in a remainder of 0.
Use 5 as the next digit of our solution. 
Result so far: 31807.95
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:
If we divide 0 by 20, we get 0 and a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 31807.95
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.

On to step 10:
20 goes into 0 0 times with a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 31807.95
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.

After the division, we end up with 31807.95 and a remainder of 0.0.