We look at the division of 357530 by 20 
The aim is to understand the frequency of 20 in 357530.

Let's proceed to step 1:
20 goes into 3 0 times with a remainder of 3.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 3 and we're left with 3.
Fetch the next digit (5) from the dividend, attach it to 3 and continue: 35 / 20

On to step 2:
20 can be fit into 35 1 times, resulting in a remainder of 15.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
If we subtract 20 from 35, we get 15.
Take the next digit (7) from the dividend and append it to 15, then repeat: 157 / 20

Step 3:
The number 20 fits into 157 7 times, leaving a remainder of 17.
The next digit of our result is 7. 
Result so far: 17.0
Subtract 140 from 157 to get 17.
Take the next digit (5) from the dividend and append it to 17, then repeat: 175 / 20

Going ahead to step 4:
When dividing 175 by 20, we get 8 with a remainder of 15.
The number 8 becomes the next digit in our result. 
Result so far: 178.0
The remainder is 15 after subtracting 160 from 175.
Grab the next digit (3) from the dividend, add it to 15, then carry on: 153 / 20

Let's proceed to step 5:
If we divide 153 by 20, we get 7 and a remainder of 13.
Write down 7 as next digit of the result. 
Result so far: 1787.0
Deduct 140 from 153 and we're left with 13.
Bring next digit (0) of the dividend behind the 13 and repeat the process: 130 / 20

Advancing to step 6:
20 can be fit into 130 6 times, resulting in a remainder of 10.
Use 6 as the next digit of our solution. 
Result so far: 17876.0
If we subtract 120 from 130, 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.

Moving on to step 7:
When dividing 100 by 20, we get 5 with a remainder of 0.
Record the quotient 5 as the next digit in the result. 
Result so far: 17876.5
If we take 100 away from 100, 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.

On to step 8:
If we divide 0 by 20, we get 0 and a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 17876.5
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.

Step 9:
20 can be fit into 0 0 times, resulting in a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 17876.5
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.

The final outcome is 17876.5, with a leftover of 0.0.