809405 divided by 20 
We're looking to find how many times 20 goes into 809405.

Going ahead to step 1:
If we divide 8 by 20, we get 0 and a remainder of 8.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 8, we end up with 8.
Take the next digit (0) from the dividend and append it to 8, then repeat: 80 / 20

Going ahead to step 2:
The number 20 fits into 80 4 times, leaving a remainder of 0.
Write down 4 as next digit of the result. 
Result so far: 4.0
Subtracting 80 from 80 leaves us with 0.
Take the next digit (9) from the dividend and append it to 0, then repeat: 9 / 20

Step 3:
20 goes into 9 0 times with a remainder of 9.
Write down 0 as next digit of the result. 
Result so far: 40.0
Deduct 0 from 9 and we're left with 9.
Fetch the next digit (4) from the dividend, attach it to 9 and continue: 94 / 20

Going ahead to step 4:
If we divide 94 by 20, we get 4 and a remainder of 14.
Write down 4 as next digit of the result. 
Result so far: 404.0
Deduct 80 from 94 and we're left with 14.
Append the next digit (0) from the dividend to 14 and continue with: 140 / 20

Step 5:
When dividing 140 by 20, we get 7 with a remainder of 0.
Use 7 as the next digit of our solution. 
Result so far: 4047.0
Subtracting 140 from 140 leaves us with 0.
Take the next digit (5) from the dividend and append it to 0, then repeat: 5 / 20

Let's proceed to step 6:
The number 20 fits into 5 0 times, leaving a remainder of 5.
The number 0 becomes the next digit in our result. 
Result so far: 40470.0
Deduct 0 from 5 and we're left with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Let's proceed to step 7:
The number 20 fits into 50 2 times, leaving a remainder of 10.
Use 2 as the next digit of our solution. 
Result so far: 40470.2
Deduct 40 from 50 and we're left 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 8:
The number 20 fits into 100 5 times, leaving a remainder of 0.
Record the quotient 5 as the next digit in the result. 
Result so far: 40470.25
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:
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: 40470.25
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.

Let's proceed to step 10:
If we divide 0 by 20, we get 0 and a remainder of 0.
The next digit of our result is 0. 
Result so far: 40470.25
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.

The quotient of the division is 40470.25, and the remainder is 0.0.