504089 ÷ 20 
The aim is to understand the frequency of 20 in 504089.

Moving on to 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
If we subtract 0 from 5, we get 5.
Include the next digit (0) from the dividend after 5, then repeat: 50 / 20

Advancing to step 2:
20 can be fit into 50 2 times, resulting in a remainder of 10.
The number 2 becomes the next digit in our result. 
Result so far: 2.0
Deduct 40 from 50 and we're left with 10.
Bring next digit (4) of the dividend behind the 10 and repeat the process: 104 / 20

On to step 3:
20 can be fit into 104 5 times, resulting in a remainder of 4.
Use 5 as the next digit of our solution. 
Result so far: 25.0
If we subtract 100 from 104, we get 4.
Fetch the next digit (0) from the dividend, attach it to 4 and continue: 40 / 20

On to step 4:
20 goes into 40 2 times with a remainder of 0.
Record the quotient 2 as the next digit in the result. 
Result so far: 252.0
Deduct 40 from 40 and we're left with 0.
Bring next digit (8) of the dividend behind the 0 and repeat the process: 8 / 20

Going ahead to step 5:
20 can be fit into 8 0 times, resulting in a remainder of 8.
The number 0 becomes the next digit in our result. 
Result so far: 2520.0
If we take 0 away from 8, we end up with 8.
Grab the next digit (9) from the dividend, add it to 8, then carry on: 89 / 20

Let's proceed to step 6:
20 goes into 89 4 times with a remainder of 9.
Put 4 as the next digit of the answer. 
Result so far: 25204.0
Deduct 80 from 89 and we're left with 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Let's proceed to step 7:
90 divided by 20 is 4 with a remainder of 10.
The next digit of our result is 4. 
Result so far: 25204.4
If we take 80 away from 90, we end up 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.

On to step 8:
20 goes into 100 5 times with a remainder of 0.
The next digit of our result is 5. 
Result so far: 25204.45
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.

Let's proceed to step 9:
When dividing 0 by 20, we get 0 with a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 25204.45
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 10:
20 can be fit into 0 0 times, resulting in a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 25204.45
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.

After the division, we end up with 25204.45 and a remainder of 0.0.