Let's divide 502435 by 20
The aim is to understand the frequency of 20 in 502435.

Step 1:
When dividing 5 by 20, we get 0 with a remainder of 5.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 5 leaves us with 5.
Take the next digit (0) from the dividend and append it to 5, then repeat: 50 / 20

On to step 2:
50 divided by 20 is 2 with a remainder of 10.
The next digit of our result is 2. 
Result so far: 2.0
Subtracting 40 from 50 leaves us with 10.
Fetch the next digit (2) from the dividend, attach it to 10 and continue: 102 / 20

Let's proceed to step 3:
If we divide 102 by 20, we get 5 and a remainder of 2.
Write down 5 as next digit of the result. 
Result so far: 25.0
Deduct 100 from 102 and we're left with 2.
Append the next digit (4) from the dividend to 2 and continue with: 24 / 20

Advancing to step 4:
20 goes into 24 1 times with a remainder of 4.
The number 1 becomes the next digit in our result. 
Result so far: 251.0
Deduct 20 from 24 and we're left with 4.
Append the next digit (3) from the dividend to 4 and continue with: 43 / 20

Going ahead to step 5:
20 goes into 43 2 times with a remainder of 3.
Write down 2 as next digit of the result. 
Result so far: 2512.0
If we subtract 40 from 43, we get 3.
Append the next digit (5) from the dividend to 3 and continue with: 35 / 20

On to step 6:
35 divided by 20 is 1 with a remainder of 15.
Use 1 as the next digit of our solution. 
Result so far: 25121.0
If we take 20 away from 35, we end up with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Moving on to step 7:
If we divide 150 by 20, we get 7 and a remainder of 10.
The next digit of our result is 7. 
Result so far: 25121.7
Deduct 140 from 150 and we're left 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.

Moving on to step 8:
100 divided by 20 is 5 with a remainder of 0.
The number 5 becomes the next digit in our result. 
Result so far: 25121.75
The remainder is 0 after subtracting 100 from 100.
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:
0 divided by 20 is 0 with a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 25121.75
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.

Advancing to step 10:
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: 25121.75
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 quotient of the division is 25121.75, and the remainder is 0.0.