20398078 divided by 605 
The aim is to understand the frequency of 605 in 20398078.

Moving on to step 1:
When dividing 2 by 605, we get 0 with a remainder of 2.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 2 and we're left with 2.
Include the next digit (0) from the dividend after 2, then repeat: 20 / 605

On to step 2:
605 can be fit into 20 0 times, resulting in a remainder of 20.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 20 after subtracting 0 from 20.
Grab the next digit (3) from the dividend, add it to 20, then carry on: 203 / 605

Let's proceed to step 3:
If we divide 203 by 605, we get 0 and a remainder of 203.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 203, we end up with 203.
Append the next digit (9) from the dividend to 203 and continue with: 2039 / 605

On to step 4:
If we divide 2039 by 605, we get 3 and a remainder of 224.
The next digit of our result is 3. 
Result so far: 3.0
If we subtract 1815 from 2039, we get 224.
Append the next digit (8) from the dividend to 224 and continue with: 2248 / 605

Moving on to step 5:
If we divide 2248 by 605, we get 3 and a remainder of 433.
The number 3 becomes the next digit in our result. 
Result so far: 33.0
Subtract 1815 from 2248 to get 433.
Append the next digit (0) from the dividend to 433 and continue with: 4330 / 605

On to step 6:
605 can be fit into 4330 7 times, resulting in a remainder of 95.
Write down 7 as next digit of the result. 
Result so far: 337.0
Subtract 4235 from 4330 to get 95.
Grab the next digit (7) from the dividend, add it to 95, then carry on: 957 / 605

Moving on to step 7:
605 can be fit into 957 1 times, resulting in a remainder of 352.
The next digit of our result is 1. 
Result so far: 3371.0
If we subtract 605 from 957, we get 352.
Take the next digit (8) from the dividend and append it to 352, then repeat: 3528 / 605

Going ahead to step 8:
If we divide 3528 by 605, we get 5 and a remainder of 503.
The number 5 becomes the next digit in our result. 
Result so far: 33715.0
Deduct 3025 from 3528 and we're left with 503.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5030, and continue the process.

Let's proceed to step 9:
The number 605 fits into 5030 8 times, leaving a remainder of 190.
The number 8 becomes the next digit in our result. 
Result so far: 33715.8
Subtract 4840 from 5030 to get 190.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1900, and continue the process.

Step 10:
1900 divided by 605 is 3 with a remainder of 85.
The number 3 becomes the next digit in our result. 
Result so far: 33715.83
Deduct 1815 from 1900 and we're left with 85.
Since there are no more digits in the dividend, we add a zero to the remainder making it 850, and continue the process.

Advancing to step 11:
850 divided by 605 is 1 with a remainder of 245.
The next digit of our result is 1. 
Result so far: 33715.831
Subtracting 605 from 850 leaves us with 245.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2450, and continue the process.

Step 12:
The number 605 fits into 2450 4 times, leaving a remainder of 30.
Write down 4 as next digit of the result. 
Result so far: 33715.8314
Deduct 2420 from 2450 and we're left with 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Going ahead to step 13:
605 goes into 300 0 times with a remainder of 300.
Put 0 as the next digit of the answer. 
Result so far: 33715.8314
If we take 0 away from 300, we end up with 300.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3000, and continue the process.

Step 14:
605 can be fit into 3000 4 times, resulting in a remainder of 580.
Record the quotient 4 as the next digit in the result. 
Result so far: 33715.831404
Subtract 2420 from 3000 to get 580.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5800, and continue the process.

Step 15:
605 can be fit into 5800 9 times, resulting in a remainder of 355.
Record the quotient 9 as the next digit in the result. 
Result so far: 33715.8314049
Subtract 5445 from 5800 to get 355.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3550, and continue the process.

Step 16:
3550 divided by 605 is 5 with a remainder of 525.
Write down 5 as next digit of the result. 
Result so far: 33715.83140495
Deduct 3025 from 3550 and we're left with 525.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5250, and continue the process.

The final outcome is 33715.83140495, with a leftover of 5.25e-07.