We're dividing 73147780 by 20 
The aim is to understand the frequency of 20 in 73147780.

Going ahead to step 1:
The number 20 fits into 7 0 times, leaving a remainder of 7.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 7, we get 7.
Fetch the next digit (3) from the dividend, attach it to 7 and continue: 73 / 20

Going ahead to step 2:
When dividing 73 by 20, we get 3 with a remainder of 13.
Put 3 as the next digit of the answer. 
Result so far: 3.0
Subtract 60 from 73 to get 13.
Include the next digit (1) from the dividend after 13, then repeat: 131 / 20

Moving on to step 3:
131 divided by 20 is 6 with a remainder of 11.
Use 6 as the next digit of our solution. 
Result so far: 36.0
If we take 120 away from 131, we end up with 11.
Grab the next digit (4) from the dividend, add it to 11, then carry on: 114 / 20

On to step 4:
20 goes into 114 5 times with a remainder of 14.
The next digit of our result is 5. 
Result so far: 365.0
Subtracting 100 from 114 leaves us with 14.
Append the next digit (7) from the dividend to 14 and continue with: 147 / 20

Step 5:
The number 20 fits into 147 7 times, leaving a remainder of 7.
Use 7 as the next digit of our solution. 
Result so far: 3657.0
Subtract 140 from 147 to get 7.
Append the next digit (7) from the dividend to 7 and continue with: 77 / 20

Moving on to step 6:
20 can be fit into 77 3 times, resulting in a remainder of 17.
Write down 3 as next digit of the result. 
Result so far: 36573.0
If we subtract 60 from 77, we get 17.
Append the next digit (8) from the dividend to 17 and continue with: 178 / 20

Step 7:
The number 20 fits into 178 8 times, leaving a remainder of 18.
Record the quotient 8 as the next digit in the result. 
Result so far: 365738.0
Subtracting 160 from 178 leaves us with 18.
Bring next digit (0) of the dividend behind the 18 and repeat the process: 180 / 20

Advancing to step 8:
20 goes into 180 9 times with a remainder of 0.
Put 9 as the next digit of the answer. 
Result so far: 3657389.0
The remainder is 0 after subtracting 180 from 180.
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:
When dividing 0 by 20, we get 0 with a remainder of 0.
The next digit of our result is 0. 
Result so far: 3657389.0
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.

Step 10:
20 goes into 0 0 times with a remainder of 0.
The next digit of our result is 0. 
Result so far: 3657389.0
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.

After the division, we end up with 3657389.0 and a remainder of 0.0.