851893 divided by 20 
Let's see how many times 20 fits into 851893.

On to step 1:
When dividing 8 by 20, we get 0 with a remainder of 8.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 8, we end up with 8.
Fetch the next digit (5) from the dividend, attach it to 8 and continue: 85 / 20

Going ahead to step 2:
The number 20 fits into 85 4 times, leaving a remainder of 5.
Use 4 as the next digit of our solution. 
Result so far: 4.0
Deduct 80 from 85 and we're left with 5.
Grab the next digit (1) from the dividend, add it to 5, then carry on: 51 / 20

Advancing to step 3:
If we divide 51 by 20, we get 2 and a remainder of 11.
The number 2 becomes the next digit in our result. 
Result so far: 42.0
If we take 40 away from 51, we end up with 11.
Append the next digit (8) from the dividend to 11 and continue with: 118 / 20

Going ahead to step 4:
When dividing 118 by 20, we get 5 with a remainder of 18.
Put 5 as the next digit of the answer. 
Result so far: 425.0
Subtracting 100 from 118 leaves us with 18.
Include the next digit (9) from the dividend after 18, then repeat: 189 / 20

Moving on to step 5:
When dividing 189 by 20, we get 9 with a remainder of 9.
Use 9 as the next digit of our solution. 
Result so far: 4259.0
The remainder is 9 after subtracting 180 from 189.
Fetch the next digit (3) from the dividend, attach it to 9 and continue: 93 / 20

Step 6:
The number 20 fits into 93 4 times, leaving a remainder of 13.
Write down 4 as next digit of the result. 
Result so far: 42594.0
Deduct 80 from 93 and we're left with 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

Going ahead to step 7:
20 can be fit into 130 6 times, resulting in a remainder of 10.
The next digit of our result is 6. 
Result so far: 42594.6
Deduct 120 from 130 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.

Let's proceed to step 8:
100 divided by 20 is 5 with a remainder of 0.
The number 5 becomes the next digit in our result. 
Result so far: 42594.65
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.

Going ahead 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: 42594.65
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.

Step 10:
20 goes into 0 0 times with a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 42594.65
Subtracting 0 from 0 leaves us 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 result is 42594.65 with a remainder of 0.0.