A:
Positive:
1 x 181407855 x 362815713 x 139544517 x 106710565 x 27908985 x 213421221 x 820851105 x 16417
Negative:
-1 x -18140785-5 x -3628157-13 x -1395445-17 x -1067105-65 x -279089-85 x -213421-221 x -82085-1105 x -16417
Unfortunately, there's not simple formula to identifying all of the factors of a number and it can be a tedious process when trying to identify the divisors of larger numbers. To find the factor combinations of the number 18,140,785, it is easier to work with a table - it's called factoring from the outside in.
We start by creating a table and writing 1 on the left side and then the number we're trying to find the factors for on the right side in a table. Then, below that, write the numbers as a negative as well.
| 1 | 18,140,785 | |
| -1 | -18,140,785 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 18,140,785.
Example:
1 x 18,140,785 = 18,140,785
and
-1 x -18,140,785 = 18,140,785
Notice both answers equal 18,140,785
With that explanation out of the way, let's continue. Next, we take the number 18,140,785 and divide it by 2:
18,140,785 ÷ 2 = 9,070,392.5
If the quotient is a whole number, then 2 and 9,070,392.5 are factors. In this case, the quotient is not a whole number. Don't write anything down and try the next divisor.
Here is what our table should look like at this step:
| 1 | 18,140,785 | |
| -1 | -18,140,785 |
Now, we try dividing 18,140,785 by 3:
18,140,785 ÷ 3 = 6,046,928.3333
If the quotient is a whole number, then 3 and 6,046,928.3333 are factors. In this case, the quotient is not a whole number. Don't write anything down and try the next divisor.
Here is what our table should look like at this step:
| 1 | 18,140,785 | |
| -1 | -18,140,785 |
Let's try dividing by 4:
18,140,785 ÷ 4 = 4,535,196.25
If the quotient is a whole number, then 4 and 4,535,196.25 are factors. In this case, the quotient is not a whole number. Don't write anything down and try the next divisor.
Here is what our table should look like at this step:
| 1 | 18,140,785 | |
| -1 | 18,140,785 |
If you did it right, you will end up with this table:
| 1 | 5 | 13 | 17 | 65 | 85 | 221 | 1,105 | 16,417 | 82,085 | 213,421 | 279,089 | 1,067,105 | 1,395,445 | 3,628,157 | 18,140,785 |
| -1 | -5 | -13 | -17 | -65 | -85 | -221 | -1,105 | -16,417 | -82,085 | -213,421 | -279,089 | -1,067,105 | -1,395,445 | -3,628,157 | -18,140,785 |
Here are some more numbers to try:
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