96643604 ÷ 20 
The aim is to understand the frequency of 20 in 96643604.

Let's proceed to step 1:
The number 20 fits into 9 0 times, leaving a remainder of 9.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 9, we get 9.
Take the next digit (6) from the dividend and append it to 9, then repeat: 96 / 20

Step 2:
If we divide 96 by 20, we get 4 and a remainder of 16.
Write down 4 as next digit of the result. 
Result so far: 4.0
If we take 80 away from 96, we end up with 16.
Include the next digit (6) from the dividend after 16, then repeat: 166 / 20

Advancing to step 3:
If we divide 166 by 20, we get 8 and a remainder of 6.
Write down 8 as next digit of the result. 
Result so far: 48.0
The remainder is 6 after subtracting 160 from 166.
Append the next digit (4) from the dividend to 6 and continue with: 64 / 20

On to step 4:
64 divided by 20 is 3 with a remainder of 4.
Put 3 as the next digit of the answer. 
Result so far: 483.0
Subtract 60 from 64 to get 4.
Append the next digit (3) from the dividend to 4 and continue with: 43 / 20

On to step 5:
When dividing 43 by 20, we get 2 with a remainder of 3.
Use 2 as the next digit of our solution. 
Result so far: 4832.0
The remainder is 3 after subtracting 40 from 43.
Grab the next digit (6) from the dividend, add it to 3, then carry on: 36 / 20

On to step 6:
When dividing 36 by 20, we get 1 with a remainder of 16.
Use 1 as the next digit of our solution. 
Result so far: 48321.0
Deduct 20 from 36 and we're left with 16.
Fetch the next digit (0) from the dividend, attach it to 16 and continue: 160 / 20

Let's proceed to step 7:
If we divide 160 by 20, we get 8 and a remainder of 0.
Put 8 as the next digit of the answer. 
Result so far: 483218.0
Subtract 160 from 160 to get 0.
Fetch the next digit (4) from the dividend, attach it to 0 and continue: 4 / 20

Moving on to step 8:
20 can be fit into 4 0 times, resulting in a remainder of 4.
The number 0 becomes the next digit in our result. 
Result so far: 4832180.0
If we take 0 away from 4, we end up with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

On to step 9:
The number 20 fits into 40 2 times, leaving a remainder of 0.
Write down 2 as next digit of the result. 
Result so far: 4832180.2
If we subtract 40 from 40, 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.

On to step 10:
When dividing 0 by 20, we get 0 with a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 4832180.2
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.

Going ahead to step 11:
If we divide 0 by 20, we get 0 and a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 4832180.2
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.

The quotient of the division is 4832180.2, and the remainder is 0.0.