A:
Positive:
1 x 186387855 x 372775711 x 169443555 x 338887113 x 164945565 x 329891243 x 149952999 x 6215
Negative:
-1 x -18638785-5 x -3727757-11 x -1694435-55 x -338887-113 x -164945-565 x -32989-1243 x -14995-2999 x -6215
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 18,638,785, 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 | 18,638,785 | |
| -1 | -18,638,785 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 18,638,785.
Example:
1 x 18,638,785 = 18,638,785
and
-1 x -18,638,785 = 18,638,785
Notice both answers equal 18,638,785
With that explanation out of the way, let's continue. Next, we take the number 18,638,785 and divide it by 2:
18,638,785 ÷ 2 = 9,319,392.5
If the quotient is a whole number, then 2 and 9,319,392.5 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 | 18,638,785 | |
| -1 | -18,638,785 |
Now, we try dividing 18,638,785 by 3:
18,638,785 ÷ 3 = 6,212,928.3333
If the quotient is a whole number, then 3 and 6,212,928.3333 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 | 18,638,785 | |
| -1 | -18,638,785 |
Let's try dividing by 4:
18,638,785 ÷ 4 = 4,659,696.25
If the quotient is a whole number, then 4 and 4,659,696.25 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 | 18,638,785 | |
| -1 | 18,638,785 |
If you did it right, you will end up with this table:
| 1 | 5 | 11 | 55 | 113 | 565 | 1,243 | 2,999 | 6,215 | 14,995 | 32,989 | 164,945 | 338,887 | 1,694,435 | 3,727,757 | 18,638,785 |
| -1 | -5 | -11 | -55 | -113 | -565 | -1,243 | -2,999 | -6,215 | -14,995 | -32,989 | -164,945 | -338,887 | -1,694,435 | -3,727,757 | -18,638,785 |
Here are some more numbers to try:
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