A:
Positive:
1 x 190906877 x 272724111 x 173551719 x 100477377 x 247931133 x 143539209 x 913431463 x 13049
Negative:
-1 x -19090687-7 x -2727241-11 x -1735517-19 x -1004773-77 x -247931-133 x -143539-209 x -91343-1463 x -13049
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 19,090,687, 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 | 19,090,687 | |
| -1 | -19,090,687 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 19,090,687.
Example:
1 x 19,090,687 = 19,090,687
and
-1 x -19,090,687 = 19,090,687
Notice both answers equal 19,090,687
With that explanation out of the way, let's continue. Next, we take the number 19,090,687 and divide it by 2:
19,090,687 ÷ 2 = 9,545,343.5
If the quotient is a whole number, then 2 and 9,545,343.5 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 | 19,090,687 | |
| -1 | -19,090,687 |
Now, we try dividing 19,090,687 by 3:
19,090,687 ÷ 3 = 6,363,562.3333
If the quotient is a whole number, then 3 and 6,363,562.3333 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 | 19,090,687 | |
| -1 | -19,090,687 |
Let's try dividing by 4:
19,090,687 ÷ 4 = 4,772,671.75
If the quotient is a whole number, then 4 and 4,772,671.75 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 | 19,090,687 | |
| -1 | 19,090,687 |
If you did it right, you will end up with this table:
| 1 | 7 | 11 | 19 | 77 | 133 | 209 | 1,463 | 13,049 | 91,343 | 143,539 | 247,931 | 1,004,773 | 1,735,517 | 2,727,241 | 19,090,687 |
| -1 | -7 | -11 | -19 | -77 | -133 | -209 | -1,463 | -13,049 | -91,343 | -143,539 | -247,931 | -1,004,773 | -1,735,517 | -2,727,241 | -19,090,687 |
Here are some more numbers to try:
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