We divide 423923 by 20
We're looking to find how many times 20 goes into 423923.

Step 1:
The number 20 fits into 4 0 times, leaving a remainder of 4.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 4, we end up with 4.
Bring next digit (2) of the dividend behind the 4 and repeat the process: 42 / 20

Moving on to step 2:
20 can be fit into 42 2 times, resulting in a remainder of 2.
Record the quotient 2 as the next digit in the result. 
Result so far: 2.0
Deduct 40 from 42 and we're left with 2.
Bring next digit (3) of the dividend behind the 2 and repeat the process: 23 / 20

Let's proceed to step 3:
20 can be fit into 23 1 times, resulting in a remainder of 3.
Write down 1 as next digit of the result. 
Result so far: 21.0
Deduct 20 from 23 and we're left with 3.
Append the next digit (9) from the dividend to 3 and continue with: 39 / 20

Advancing to step 4:
20 can be fit into 39 1 times, resulting in a remainder of 19.
Use 1 as the next digit of our solution. 
Result so far: 211.0
If we subtract 20 from 39, we get 19.
Fetch the next digit (2) from the dividend, attach it to 19 and continue: 192 / 20

Advancing to step 5:
192 divided by 20 is 9 with a remainder of 12.
Use 9 as the next digit of our solution. 
Result so far: 2119.0
Deduct 180 from 192 and we're left with 12.
Take the next digit (3) from the dividend and append it to 12, then repeat: 123 / 20

Advancing to step 6:
When dividing 123 by 20, we get 6 with a remainder of 3.
Put 6 as the next digit of the answer. 
Result so far: 21196.0
The remainder is 3 after subtracting 120 from 123.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Advancing to step 7:
20 goes into 30 1 times with a remainder of 10.
Put 1 as the next digit of the answer. 
Result so far: 21196.1
Subtract 20 from 30 to get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Step 8:
If we divide 100 by 20, we get 5 and a remainder of 0.
Record the quotient 5 as the next digit in the result. 
Result so far: 21196.15
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.

Step 9:
The number 20 fits into 0 0 times, leaving a remainder of 0.
The next digit of our result is 0. 
Result so far: 21196.15
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.

Advancing to step 10:
20 can be fit into 0 0 times, resulting in a remainder of 0.
The next digit of our result is 0. 
Result so far: 21196.15
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 21196.15, with a leftover of 0.0.