We're dividing 804405 by 20 
We want to divide 804405 by 20.

Step 1:
20 goes into 8 0 times with a remainder of 8.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 8 after subtracting 0 from 8.
Include the next digit (0) from the dividend after 8, then repeat: 80 / 20

Advancing to step 2:
80 divided by 20 is 4 with a remainder of 0.
The number 4 becomes the next digit in our result. 
Result so far: 4.0
Deduct 80 from 80 and we're left with 0.
Fetch the next digit (4) from the dividend, attach it to 0 and continue: 4 / 20

On to step 3:
The number 20 fits into 4 0 times, leaving a remainder of 4.
Write down 0 as next digit of the result. 
Result so far: 40.0
If we subtract 0 from 4, we get 4.
Bring next digit (4) of the dividend behind the 4 and repeat the process: 44 / 20

On to step 4:
The number 20 fits into 44 2 times, leaving a remainder of 4.
Record the quotient 2 as the next digit in the result. 
Result so far: 402.0
Subtracting 40 from 44 leaves us with 4.
Take the next digit (0) from the dividend and append it to 4, then repeat: 40 / 20

On to step 5:
20 can be fit into 40 2 times, resulting in a remainder of 0.
The next digit of our result is 2. 
Result so far: 4022.0
If we take 40 away from 40, we end up 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:
If we divide 5 by 20, we get 0 and a remainder of 5.
Put 0 as the next digit of the answer. 
Result so far: 40220.0
The remainder is 5 after subtracting 0 from 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:
20 can be fit into 50 2 times, resulting in a remainder of 10.
Record the quotient 2 as the next digit in the result. 
Result so far: 40220.2
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.

Moving on to step 8:
If we divide 100 by 20, we get 5 and a remainder of 0.
Use 5 as the next digit of our solution. 
Result so far: 40220.25
Subtract 100 from 100 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.

Advancing to step 9:
20 can be fit into 0 0 times, resulting in a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 40220.25
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.

Step 10:
When dividing 0 by 20, we get 0 with a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 40220.25
The remainder is 0 after subtracting 0 from 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 outcome is 40220.25, with a leftover of 0.0.