690090 divided by 20 
The aim is to understand the frequency of 20 in 690090.

Moving on to step 1:
If we divide 6 by 20, we get 0 and a remainder of 6.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 6 to get 6.
Append the next digit (9) from the dividend to 6 and continue with: 69 / 20

Moving on to step 2:
When dividing 69 by 20, we get 3 with a remainder of 9.
The number 3 becomes the next digit in our result. 
Result so far: 3.0
If we subtract 60 from 69, we get 9.
Append the next digit (0) from the dividend to 9 and continue with: 90 / 20

On to step 3:
If we divide 90 by 20, we get 4 and a remainder of 10.
Put 4 as the next digit of the answer. 
Result so far: 34.0
If we take 80 away from 90, we end up with 10.
Append the next digit (0) from the dividend to 10 and continue with: 100 / 20

Step 4:
100 divided by 20 is 5 with a remainder of 0.
The number 5 becomes the next digit in our result. 
Result so far: 345.0
If we take 100 away from 100, we end up with 0.
Take the next digit (9) from the dividend and append it to 0, then repeat: 9 / 20

Advancing to step 5:
The number 20 fits into 9 0 times, leaving a remainder of 9.
Put 0 as the next digit of the answer. 
Result so far: 3450.0
Deduct 0 from 9 and we're left with 9.
Bring next digit (0) of the dividend behind the 9 and repeat the process: 90 / 20

Step 6:
20 goes into 90 4 times with a remainder of 10.
Put 4 as the next digit of the answer. 
Result so far: 34504.0
If we subtract 80 from 90, 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.

Let's proceed to step 7:
20 goes into 100 5 times with a remainder of 0.
The number 5 becomes the next digit in our result. 
Result so far: 34504.5
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.

Moving on to step 8:
20 goes into 0 0 times with a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 34504.5
Deduct 0 from 0 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.

Moving on to step 9:
20 goes into 0 0 times with a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 34504.5
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.

The final result is 34504.5 with a remainder of 0.0.