321209 divided by 20 
The aim is to understand the frequency of 20 in 321209.

Let's proceed to step 1:
When dividing 3 by 20, we get 0 with a remainder of 3.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 3, we end up with 3.
Append the next digit (2) from the dividend to 3 and continue with: 32 / 20

Step 2:
20 goes into 32 1 times with a remainder of 12.
Use 1 as the next digit of our solution. 
Result so far: 1.0
The remainder is 12 after subtracting 20 from 32.
Bring next digit (1) of the dividend behind the 12 and repeat the process: 121 / 20

Moving on to step 3:
121 divided by 20 is 6 with a remainder of 1.
Write down 6 as next digit of the result. 
Result so far: 16.0
Subtract 120 from 121 to get 1.
Include the next digit (2) from the dividend after 1, then repeat: 12 / 20

Step 4:
If we divide 12 by 20, we get 0 and a remainder of 12.
Use 0 as the next digit of our solution. 
Result so far: 160.0
Deduct 0 from 12 and we're left with 12.
Include the next digit (0) from the dividend after 12, then repeat: 120 / 20

Moving on to step 5:
20 goes into 120 6 times with a remainder of 0.
Put 6 as the next digit of the answer. 
Result so far: 1606.0
If we take 120 away from 120, we end up with 0.
Include the next digit (9) from the dividend after 0, then repeat: 9 / 20

Going ahead to step 6:
20 can be fit into 9 0 times, resulting in a remainder of 9.
The next digit of our result is 0. 
Result so far: 16060.0
If we subtract 0 from 9, we get 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Step 7:
90 divided by 20 is 4 with a remainder of 10.
Put 4 as the next digit of the answer. 
Result so far: 16060.4
Subtracting 80 from 90 leaves us 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.

Let's proceed to step 8:
20 can be fit into 100 5 times, resulting in a remainder of 0.
The next digit of our result is 5. 
Result so far: 16060.45
Deduct 100 from 100 and we're left 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.

Advancing to step 9:
When dividing 0 by 20, we get 0 with a remainder of 0.
The next digit of our result is 0. 
Result so far: 16060.45
The remainder is 0 after subtracting 0 from 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 10:
20 can be fit into 0 0 times, resulting in a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 16060.45
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.

The final result is 16060.45 with a remainder of 0.0.