We divide 578160 by 20
The aim is to understand the frequency of 20 in 578160.

Advancing to step 1:
5 divided by 20 is 0 with a remainder of 5.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 5 after subtracting 0 from 5.
Take the next digit (7) from the dividend and append it to 5, then repeat: 57 / 20

Let's proceed to step 2:
20 can be fit into 57 2 times, resulting in a remainder of 17.
Write down 2 as next digit of the result. 
Result so far: 2.0
Deduct 40 from 57 and we're left with 17.
Append the next digit (8) from the dividend to 17 and continue with: 178 / 20

Step 3:
20 goes into 178 8 times with a remainder of 18.
The number 8 becomes the next digit in our result. 
Result so far: 28.0
If we take 160 away from 178, we end up with 18.
Include the next digit (1) from the dividend after 18, then repeat: 181 / 20

Moving on to step 4:
The number 20 fits into 181 9 times, leaving a remainder of 1.
Write down 9 as next digit of the result. 
Result so far: 289.0
Subtracting 180 from 181 leaves us with 1.
Fetch the next digit (6) from the dividend, attach it to 1 and continue: 16 / 20

Moving on to step 5:
When dividing 16 by 20, we get 0 with a remainder of 16.
The next digit of our result is 0. 
Result so far: 2890.0
If we take 0 away from 16, we end up with 16.
Bring next digit (0) of the dividend behind the 16 and repeat the process: 160 / 20

Moving on to step 6:
160 divided by 20 is 8 with a remainder of 0.
Write down 8 as next digit of the result. 
Result so far: 28908.0
The remainder is 0 after subtracting 160 from 160.
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 7:
20 can be fit into 0 0 times, resulting in a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 28908.0
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.

Step 8:
The number 20 fits into 0 0 times, leaving a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 28908.0
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.

Our division results in 28908.0 with a remaining 0.0.