25085139 ÷ 20 
The aim is to understand the frequency of 20 in 25085139.

Going ahead to step 1:
When dividing 2 by 20, we get 0 with a remainder of 2.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 2, we get 2.
Append the next digit (5) from the dividend to 2 and continue with: 25 / 20

Let's proceed to step 2:
If we divide 25 by 20, we get 1 and a remainder of 5.
Use 1 as the next digit of our solution. 
Result so far: 1.0
If we take 20 away from 25, we end up with 5.
Append the next digit (0) from the dividend to 5 and continue with: 50 / 20

Advancing to step 3:
If we divide 50 by 20, we get 2 and a remainder of 10.
Use 2 as the next digit of our solution. 
Result so far: 12.0
If we subtract 40 from 50, we get 10.
Bring next digit (8) of the dividend behind the 10 and repeat the process: 108 / 20

Moving on to step 4:
If we divide 108 by 20, we get 5 and a remainder of 8.
Record the quotient 5 as the next digit in the result. 
Result so far: 125.0
Subtracting 100 from 108 leaves us with 8.
Append the next digit (5) from the dividend to 8 and continue with: 85 / 20

Step 5:
20 goes into 85 4 times with a remainder of 5.
The number 4 becomes the next digit in our result. 
Result so far: 1254.0
Subtracting 80 from 85 leaves us with 5.
Append the next digit (1) from the dividend to 5 and continue with: 51 / 20

Moving on to step 6:
51 divided by 20 is 2 with a remainder of 11.
Put 2 as the next digit of the answer. 
Result so far: 12542.0
Subtracting 40 from 51 leaves us with 11.
Include the next digit (3) from the dividend after 11, then repeat: 113 / 20

Step 7:
20 can be fit into 113 5 times, resulting in a remainder of 13.
The next digit of our result is 5. 
Result so far: 125425.0
Deduct 100 from 113 and we're left with 13.
Fetch the next digit (9) from the dividend, attach it to 13 and continue: 139 / 20

Advancing to step 8:
139 divided by 20 is 6 with a remainder of 19.
Use 6 as the next digit of our solution. 
Result so far: 1254256.0
If we take 120 away from 139, we end up with 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Let's proceed to step 9:
If we divide 190 by 20, we get 9 and a remainder of 10.
Use 9 as the next digit of our solution. 
Result so far: 1254256.9
If we take 180 away from 190, 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.

Going ahead to step 10:
100 divided by 20 is 5 with a remainder of 0.
Put 5 as the next digit of the answer. 
Result so far: 1254256.95
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 11:
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: 1254256.95
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.

On to step 12:
0 divided by 20 is 0 with a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 1254256.95
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 1254256.95 with a remainder of 0.0.