We look at the division of 45891 by 20 
The aim is to understand the frequency of 20 in 45891.

On to step 1:
The number 20 fits into 4 0 times, leaving a remainder of 4.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 4 after subtracting 0 from 4.
Grab the next digit (5) from the dividend, add it to 4, then carry on: 45 / 20

Moving on to step 2:
If we divide 45 by 20, we get 2 and a remainder of 5.
Record the quotient 2 as the next digit in the result. 
Result so far: 2.0
If we take 40 away from 45, we end up with 5.
Append the next digit (8) from the dividend to 5 and continue with: 58 / 20

Advancing to step 3:
If we divide 58 by 20, we get 2 and a remainder of 18.
Use 2 as the next digit of our solution. 
Result so far: 22.0
If we subtract 40 from 58, we get 18.
Append the next digit (9) from the dividend to 18 and continue with: 189 / 20

Let's proceed to step 4:
189 divided by 20 is 9 with a remainder of 9.
The next digit of our result is 9. 
Result so far: 229.0
Subtract 180 from 189 to get 9.
Append the next digit (1) from the dividend to 9 and continue with: 91 / 20

Moving on to step 5:
The number 20 fits into 91 4 times, leaving a remainder of 11.
The next digit of our result is 4. 
Result so far: 2294.0
Subtract 80 from 91 to get 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Step 6:
When dividing 110 by 20, we get 5 with a remainder of 10.
The number 5 becomes the next digit in our result. 
Result so far: 2294.5
If we take 100 away from 110, we end up with 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 7:
The number 20 fits into 100 5 times, leaving a remainder of 0.
Record the quotient 5 as the next digit in the result. 
Result so far: 2294.55
Subtracting 100 from 100 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.

After the division, we end up with 2294.55 and a remainder of 0.0.