16684961 ÷ 870 
We want to divide 16684961 by 870.

Advancing to step 1:
When dividing 1 by 870, we get 0 with a remainder of 1.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 1 and we're left with 1.
Bring next digit (6) of the dividend behind the 1 and repeat the process: 16 / 870

Moving on to step 2:
16 divided by 870 is 0 with a remainder of 16.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 16 leaves us with 16.
Fetch the next digit (6) from the dividend, attach it to 16 and continue: 166 / 870

Step 3:
If we divide 166 by 870, we get 0 and a remainder of 166.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 166, we end up with 166.
Include the next digit (8) from the dividend after 166, then repeat: 1668 / 870

Going ahead to step 4:
870 goes into 1668 1 times with a remainder of 798.
Put 1 as the next digit of the answer. 
Result so far: 1.0
The remainder is 798 after subtracting 870 from 1668.
Include the next digit (4) from the dividend after 798, then repeat: 7984 / 870

Let's proceed to step 5:
870 can be fit into 7984 9 times, resulting in a remainder of 154.
Use 9 as the next digit of our solution. 
Result so far: 19.0
Subtract 7830 from 7984 to get 154.
Grab the next digit (9) from the dividend, add it to 154, then carry on: 1549 / 870

Moving on to step 6:
870 can be fit into 1549 1 times, resulting in a remainder of 679.
Put 1 as the next digit of the answer. 
Result so far: 191.0
If we subtract 870 from 1549, we get 679.
Bring next digit (6) of the dividend behind the 679 and repeat the process: 6796 / 870

Step 7:
When dividing 6796 by 870, we get 7 with a remainder of 706.
Write down 7 as next digit of the result. 
Result so far: 1917.0
If we subtract 6090 from 6796, we get 706.
Append the next digit (1) from the dividend to 706 and continue with: 7061 / 870

Advancing to step 8:
7061 divided by 870 is 8 with a remainder of 101.
Use 8 as the next digit of our solution. 
Result so far: 19178.0
Deduct 6960 from 7061 and we're left with 101.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1010, and continue the process.

Let's proceed to step 9:
870 goes into 1010 1 times with a remainder of 140.
Record the quotient 1 as the next digit in the result. 
Result so far: 19178.1
If we take 870 away from 1010, we end up with 140.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1400, and continue the process.

Going ahead to step 10:
1400 divided by 870 is 1 with a remainder of 530.
The number 1 becomes the next digit in our result. 
Result so far: 19178.11
Deduct 870 from 1400 and we're left with 530.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5300, and continue the process.

After the division, we end up with 19178.11 and a remainder of 0.53.