353220 ÷ 20 
Let's see how many times 20 fits into 353220.

Going ahead to step 1:
3 divided by 20 is 0 with a remainder of 3.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 3 leaves us with 3.
Include the next digit (5) from the dividend after 3, then repeat: 35 / 20

On to step 2:
If we divide 35 by 20, we get 1 and a remainder of 15.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
Subtracting 20 from 35 leaves us with 15.
Grab the next digit (3) from the dividend, add it to 15, then carry on: 153 / 20

Step 3:
When dividing 153 by 20, we get 7 with a remainder of 13.
The number 7 becomes the next digit in our result. 
Result so far: 17.0
The remainder is 13 after subtracting 140 from 153.
Include the next digit (2) from the dividend after 13, then repeat: 132 / 20

Step 4:
If we divide 132 by 20, we get 6 and a remainder of 12.
Use 6 as the next digit of our solution. 
Result so far: 176.0
Subtracting 120 from 132 leaves us with 12.
Take the next digit (2) from the dividend and append it to 12, then repeat: 122 / 20

Going ahead to step 5:
When dividing 122 by 20, we get 6 with a remainder of 2.
The number 6 becomes the next digit in our result. 
Result so far: 1766.0
Subtract 120 from 122 to get 2.
Grab the next digit (0) from the dividend, add it to 2, then carry on: 20 / 20

Moving on to step 6:
20 can be fit into 20 1 times, resulting in a remainder of 0.
Record the quotient 1 as the next digit in the result. 
Result so far: 17661.0
Deduct 20 from 20 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.

Let's proceed to step 7:
20 can be fit into 0 0 times, resulting in a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 17661.0
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.

Moving on to step 8:
0 divided by 20 is 0 with a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 17661.0
If we subtract 0 from 0, we 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.

Our division results in 17661.0 with a remaining 0.0.