We look at the division of 628042 by 20 
The aim is to understand the frequency of 20 in 628042.

On to step 1:
20 goes into 6 0 times with a remainder of 6.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 6 after subtracting 0 from 6.
Take the next digit (2) from the dividend and append it to 6, then repeat: 62 / 20

Step 2:
20 goes into 62 3 times with a remainder of 2.
The number 3 becomes the next digit in our result. 
Result so far: 3.0
Deduct 60 from 62 and we're left with 2.
Append the next digit (8) from the dividend to 2 and continue with: 28 / 20

Step 3:
The number 20 fits into 28 1 times, leaving a remainder of 8.
Use 1 as the next digit of our solution. 
Result so far: 31.0
Subtract 20 from 28 to get 8.
Grab the next digit (0) from the dividend, add it to 8, then carry on: 80 / 20

Step 4:
80 divided by 20 is 4 with a remainder of 0.
The next digit of our result is 4. 
Result so far: 314.0
The remainder is 0 after subtracting 80 from 80.
Fetch the next digit (4) from the dividend, attach it to 0 and continue: 4 / 20

Advancing to step 5:
4 divided by 20 is 0 with a remainder of 4.
Put 0 as the next digit of the answer. 
Result so far: 3140.0
The remainder is 4 after subtracting 0 from 4.
Fetch the next digit (2) from the dividend, attach it to 4 and continue: 42 / 20

Moving on to step 6:
When dividing 42 by 20, we get 2 with a remainder of 2.
The number 2 becomes the next digit in our result. 
Result so far: 31402.0
The remainder is 2 after subtracting 40 from 42.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Going ahead to step 7:
The number 20 fits into 20 1 times, leaving a remainder of 0.
Put 1 as the next digit of the answer. 
Result so far: 31402.1
The remainder is 0 after subtracting 20 from 20.
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 8:
0 divided by 20 is 0 with a remainder of 0.
The next digit of our result is 0. 
Result so far: 31402.1
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.

Advancing to step 9:
When dividing 0 by 20, we get 0 with a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 31402.1
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.

Our division results in 31402.1 with a remaining 0.0.