645499 divided by 20 
The aim is to understand the frequency of 20 in 645499.

Advancing to step 1:
The number 20 fits into 6 0 times, leaving a remainder of 6.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 6 to get 6.
Append the next digit (4) from the dividend to 6 and continue with: 64 / 20

Advancing to step 2:
20 goes into 64 3 times with a remainder of 4.
Write down 3 as next digit of the result. 
Result so far: 3.0
If we take 60 away from 64, we end up with 4.
Append the next digit (5) from the dividend to 4 and continue with: 45 / 20

Advancing to step 3:
If we divide 45 by 20, we get 2 and a remainder of 5.
Use 2 as the next digit of our solution. 
Result so far: 32.0
Deduct 40 from 45 and we're left with 5.
Append the next digit (4) from the dividend to 5 and continue with: 54 / 20

On to step 4:
54 divided by 20 is 2 with a remainder of 14.
Put 2 as the next digit of the answer. 
Result so far: 322.0
Subtracting 40 from 54 leaves us with 14.
Include the next digit (9) from the dividend after 14, then repeat: 149 / 20

Advancing to step 5:
If we divide 149 by 20, we get 7 and a remainder of 9.
Put 7 as the next digit of the answer. 
Result so far: 3227.0
If we take 140 away from 149, we end up with 9.
Bring next digit (9) of the dividend behind the 9 and repeat the process: 99 / 20

On to step 6:
20 goes into 99 4 times with a remainder of 19.
Write down 4 as next digit of the result. 
Result so far: 32274.0
Deduct 80 from 99 and we're left 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.

Going ahead to step 7:
190 divided by 20 is 9 with a remainder of 10.
Use 9 as the next digit of our solution. 
Result so far: 32274.9
If we subtract 180 from 190, we get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Moving on to step 8:
100 divided by 20 is 5 with a remainder of 0.
Record the quotient 5 as the next digit in the result. 
Result so far: 32274.95
Deduct 100 from 100 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.

Advancing to step 9:
0 divided by 20 is 0 with a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 32274.95
Subtracting 0 from 0 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.

On to step 10:
When dividing 0 by 20, we get 0 with a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 32274.95
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 32274.95 with a balance of 0.0.