123570 ÷ 20 
The aim is to understand the frequency of 20 in 123570.

Advancing to step 1:
If we divide 1 by 20, we get 0 and a remainder of 1.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 1, we get 1.
Bring next digit (2) of the dividend behind the 1 and repeat the process: 12 / 20

Let's proceed to step 2:
20 can be fit into 12 0 times, resulting in a remainder of 12.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 12 after subtracting 0 from 12.
Take the next digit (3) from the dividend and append it to 12, then repeat: 123 / 20

Step 3:
20 goes into 123 6 times with a remainder of 3.
Use 6 as the next digit of our solution. 
Result so far: 6.0
The remainder is 3 after subtracting 120 from 123.
Grab the next digit (5) from the dividend, add it to 3, then carry on: 35 / 20

Moving on to step 4:
35 divided by 20 is 1 with a remainder of 15.
The next digit of our result is 1. 
Result so far: 61.0
Deduct 20 from 35 and we're left with 15.
Append the next digit (7) from the dividend to 15 and continue with: 157 / 20

On to step 5:
157 divided by 20 is 7 with a remainder of 17.
Record the quotient 7 as the next digit in the result. 
Result so far: 617.0
The remainder is 17 after subtracting 140 from 157.
Grab the next digit (0) from the dividend, add it to 17, then carry on: 170 / 20

Going ahead to step 6:
20 can be fit into 170 8 times, resulting in a remainder of 10.
The number 8 becomes the next digit in our result. 
Result so far: 6178.0
If we subtract 160 from 170, we 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.

Advancing to step 7:
When dividing 100 by 20, we get 5 with a remainder of 0.
Write down 5 as next digit of the result. 
Result so far: 6178.5
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.

Moving on to step 8:
20 goes into 0 0 times with a remainder of 0.
The next digit of our result is 0. 
Result so far: 6178.5
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.

Let's proceed to step 9:
The number 20 fits into 0 0 times, leaving a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 6178.5
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.

Our division results in 6178.5 with a remaining 0.0.