686685 ÷ 20 
Let's see how many times 20 fits into 686685.

Step 1:
20 can be fit into 6 0 times, resulting in a remainder of 6.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 6, we end up with 6.
Append the next digit (8) from the dividend to 6 and continue with: 68 / 20

On to step 2:
20 can be fit into 68 3 times, resulting in a remainder of 8.
The number 3 becomes the next digit in our result. 
Result so far: 3.0
Subtracting 60 from 68 leaves us with 8.
Grab the next digit (6) from the dividend, add it to 8, then carry on: 86 / 20

Advancing to step 3:
86 divided by 20 is 4 with a remainder of 6.
Use 4 as the next digit of our solution. 
Result so far: 34.0
If we take 80 away from 86, we end up with 6.
Bring next digit (6) of the dividend behind the 6 and repeat the process: 66 / 20

On to step 4:
20 goes into 66 3 times with a remainder of 6.
Put 3 as the next digit of the answer. 
Result so far: 343.0
If we subtract 60 from 66, we get 6.
Fetch the next digit (8) from the dividend, attach it to 6 and continue: 68 / 20

Step 5:
20 can be fit into 68 3 times, resulting in a remainder of 8.
The number 3 becomes the next digit in our result. 
Result so far: 3433.0
If we subtract 60 from 68, we get 8.
Take the next digit (5) from the dividend and append it to 8, then repeat: 85 / 20

Step 6:
When dividing 85 by 20, we get 4 with a remainder of 5.
Record the quotient 4 as the next digit in the result. 
Result so far: 34334.0
If we take 80 away from 85, we end up 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.

Step 7:
20 goes into 50 2 times with a remainder of 10.
Record the quotient 2 as the next digit in the result. 
Result so far: 34334.2
Subtract 40 from 50 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.

Moving on to step 8:
When dividing 100 by 20, we get 5 with a remainder of 0.
Record the quotient 5 as the next digit in the result. 
Result so far: 34334.25
If we subtract 100 from 100, 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.

On to step 9:
20 can be fit into 0 0 times, resulting in a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 34334.25
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.

Moving on to step 10:
The number 20 fits into 0 0 times, leaving a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 34334.25
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 final outcome is 34334.25, with a leftover of 0.0.