We divide 16215820 by 809
Let's see how many times 809 fits into 16215820.

Moving on to step 1:
809 goes into 1 0 times with a remainder of 1.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 1 leaves us with 1.
Fetch the next digit (6) from the dividend, attach it to 1 and continue: 16 / 809

Moving on to step 2:
If we divide 16 by 809, we get 0 and a remainder of 16.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 16, we get 16.
Grab the next digit (2) from the dividend, add it to 16, then carry on: 162 / 809

Let's proceed to step 3:
If we divide 162 by 809, we get 0 and a remainder of 162.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 162 leaves us with 162.
Include the next digit (1) from the dividend after 162, then repeat: 1621 / 809

Moving on to step 4:
1621 divided by 809 is 2 with a remainder of 3.
Put 2 as the next digit of the answer. 
Result so far: 2.0
Subtracting 1618 from 1621 leaves us with 3.
Include the next digit (5) from the dividend after 3, then repeat: 35 / 809

Moving on to step 5:
809 can be fit into 35 0 times, resulting in a remainder of 35.
Put 0 as the next digit of the answer. 
Result so far: 20.0
If we take 0 away from 35, we end up with 35.
Bring next digit (8) of the dividend behind the 35 and repeat the process: 358 / 809

Step 6:
If we divide 358 by 809, we get 0 and a remainder of 358.
Use 0 as the next digit of our solution. 
Result so far: 200.0
Subtract 0 from 358 to get 358.
Take the next digit (2) from the dividend and append it to 358, then repeat: 3582 / 809

Let's proceed to step 7:
If we divide 3582 by 809, we get 4 and a remainder of 346.
The number 4 becomes the next digit in our result. 
Result so far: 2004.0
If we subtract 3236 from 3582, we get 346.
Take the next digit (0) from the dividend and append it to 346, then repeat: 3460 / 809

Moving on to step 8:
809 goes into 3460 4 times with a remainder of 224.
Use 4 as the next digit of our solution. 
Result so far: 20044.0
The remainder is 224 after subtracting 3236 from 3460.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2240, and continue the process.

Step 9:
When dividing 2240 by 809, we get 2 with a remainder of 622.
The next digit of our result is 2. 
Result so far: 20044.2
Deduct 1618 from 2240 and we're left with 622.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6220, and continue the process.

On to step 10:
The number 809 fits into 6220 7 times, leaving a remainder of 557.
The number 7 becomes the next digit in our result. 
Result so far: 20044.27
Subtracting 5663 from 6220 leaves us with 557.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5570, and continue the process.

Step 11:
809 can be fit into 5570 6 times, resulting in a remainder of 716.
Put 6 as the next digit of the answer. 
Result so far: 20044.276
Deduct 4854 from 5570 and we're left with 716.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7160, and continue the process.

Step 12:
809 can be fit into 7160 8 times, resulting in a remainder of 688.
The number 8 becomes the next digit in our result. 
Result so far: 20044.2768
Subtract 6472 from 7160 to get 688.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6880, and continue the process.

Let's proceed to step 13:
6880 divided by 809 is 8 with a remainder of 408.
Write down 8 as next digit of the result. 
Result so far: 20044.27688
If we take 6472 away from 6880, we end up with 408.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4080, and continue the process.

The final outcome is 20044.27688, with a leftover of 0.000408.