915890 divided by 20 
The aim is to understand the frequency of 20 in 915890.

Going ahead to step 1:
If we divide 9 by 20, we get 0 and a remainder of 9.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 9, we end up with 9.
Include the next digit (1) from the dividend after 9, then repeat: 91 / 20

Step 2:
The number 20 fits into 91 4 times, leaving a remainder of 11.
Use 4 as the next digit of our solution. 
Result so far: 4.0
Subtracting 80 from 91 leaves us with 11.
Include the next digit (5) from the dividend after 11, then repeat: 115 / 20

Going ahead to step 3:
When dividing 115 by 20, we get 5 with a remainder of 15.
The number 5 becomes the next digit in our result. 
Result so far: 45.0
If we take 100 away from 115, we end up with 15.
Include the next digit (8) from the dividend after 15, then repeat: 158 / 20

Going ahead to step 4:
The number 20 fits into 158 7 times, leaving a remainder of 18.
Use 7 as the next digit of our solution. 
Result so far: 457.0
If we take 140 away from 158, we end up with 18.
Grab the next digit (9) from the dividend, add it to 18, then carry on: 189 / 20

On to step 5:
If we divide 189 by 20, we get 9 and a remainder of 9.
Use 9 as the next digit of our solution. 
Result so far: 4579.0
If we subtract 180 from 189, we get 9.
Append the next digit (0) from the dividend to 9 and continue with: 90 / 20

On to step 6:
90 divided by 20 is 4 with a remainder of 10.
The number 4 becomes the next digit in our result. 
Result so far: 45794.0
Subtract 80 from 90 to 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.

On to step 7:
If we divide 100 by 20, we get 5 and a remainder of 0.
Write down 5 as next digit of the result. 
Result so far: 45794.5
If we subtract 100 from 100, 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.

Going ahead to step 8:
20 goes into 0 0 times with a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 45794.5
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.

Let's proceed to step 9:
20 goes into 0 0 times with a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 45794.5
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.

The final outcome is 45794.5, with a leftover of 0.0.