We're dividing 20721850 by 437 
The aim is to understand the frequency of 437 in 20721850.

Going ahead to step 1:
2 divided by 437 is 0 with a remainder of 2.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 2 to get 2.
Include the next digit (0) from the dividend after 2, then repeat: 20 / 437

Going ahead to step 2:
When dividing 20 by 437, we get 0 with a remainder of 20.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 20 and we're left with 20.
Grab the next digit (7) from the dividend, add it to 20, then carry on: 207 / 437

On to step 3:
437 can be fit into 207 0 times, resulting in a remainder of 207.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 207 to get 207.
Append the next digit (2) from the dividend to 207 and continue with: 2072 / 437

Step 4:
437 goes into 2072 4 times with a remainder of 324.
Record the quotient 4 as the next digit in the result. 
Result so far: 4.0
The remainder is 324 after subtracting 1748 from 2072.
Fetch the next digit (1) from the dividend, attach it to 324 and continue: 3241 / 437

Moving on to step 5:
When dividing 3241 by 437, we get 7 with a remainder of 182.
Record the quotient 7 as the next digit in the result. 
Result so far: 47.0
Subtract 3059 from 3241 to get 182.
Append the next digit (8) from the dividend to 182 and continue with: 1828 / 437

Let's proceed to step 6:
The number 437 fits into 1828 4 times, leaving a remainder of 80.
The number 4 becomes the next digit in our result. 
Result so far: 474.0
Deduct 1748 from 1828 and we're left with 80.
Append the next digit (5) from the dividend to 80 and continue with: 805 / 437

Moving on to step 7:
When dividing 805 by 437, we get 1 with a remainder of 368.
Record the quotient 1 as the next digit in the result. 
Result so far: 4741.0
The remainder is 368 after subtracting 437 from 805.
Fetch the next digit (0) from the dividend, attach it to 368 and continue: 3680 / 437

Advancing to step 8:
3680 divided by 437 is 8 with a remainder of 184.
Put 8 as the next digit of the answer. 
Result so far: 47418.0
The remainder is 184 after subtracting 3496 from 3680.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1840, and continue the process.

Advancing to step 9:
If we divide 1840 by 437, we get 4 and a remainder of 92.
Put 4 as the next digit of the answer. 
Result so far: 47418.4
Subtract 1748 from 1840 to get 92.
Since there are no more digits in the dividend, we add a zero to the remainder making it 920, and continue the process.

Going ahead to step 10:
920 divided by 437 is 2 with a remainder of 46.
Put 2 as the next digit of the answer. 
Result so far: 47418.42
Subtracting 874 from 920 leaves us with 46.
Since there are no more digits in the dividend, we add a zero to the remainder making it 460, and continue the process.

Step 11:
The number 437 fits into 460 1 times, leaving a remainder of 23.
The next digit of our result is 1. 
Result so far: 47418.421
If we take 437 away from 460, we end up with 23.
Since there are no more digits in the dividend, we add a zero to the remainder making it 230, and continue the process.

Step 12:
437 can be fit into 230 0 times, resulting in a remainder of 230.
Write down 0 as next digit of the result. 
Result so far: 47418.421
If we subtract 0 from 230, we get 230.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2300, and continue the process.

Advancing to step 13:
2300 divided by 437 is 5 with a remainder of 115.
The next digit of our result is 5. 
Result so far: 47418.42105
Subtracting 2185 from 2300 leaves us with 115.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1150, and continue the process.

Moving on to step 14:
1150 divided by 437 is 2 with a remainder of 276.
The next digit of our result is 2. 
Result so far: 47418.421052
Deduct 874 from 1150 and we're left with 276.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2760, and continue the process.

On to step 15:
437 goes into 2760 6 times with a remainder of 138.
The number 6 becomes the next digit in our result. 
Result so far: 47418.4210526
Subtract 2622 from 2760 to get 138.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1380, and continue the process.

Let's proceed to step 16:
If we divide 1380 by 437, we get 3 and a remainder of 69.
Use 3 as the next digit of our solution. 
Result so far: 47418.42105263
The remainder is 69 after subtracting 1311 from 1380.
Since there are no more digits in the dividend, we add a zero to the remainder making it 690, and continue the process.

Our division results in 47418.42105263 with a remaining 6.9e-08.