A:
Positive:
1 x 13207817 x 18868311 x 12007117 x 7769377 x 17153119 x 11099187 x 70631009 x 1309
Negative:
-1 x -1320781-7 x -188683-11 x -120071-17 x -77693-77 x -17153-119 x -11099-187 x -7063-1009 x -1309
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 1,320,781, 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 | 1,320,781 | |
| -1 | -1,320,781 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 1,320,781.
Example:
1 x 1,320,781 = 1,320,781
and
-1 x -1,320,781 = 1,320,781
Notice both answers equal 1,320,781
With that explanation out of the way, let's continue. Next, we take the number 1,320,781 and divide it by 2:
1,320,781 ÷ 2 = 660,390.5
If the quotient is a whole number, then 2 and 660,390.5 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 | 1,320,781 | |
| -1 | -1,320,781 |
Now, we try dividing 1,320,781 by 3:
1,320,781 ÷ 3 = 440,260.3333
If the quotient is a whole number, then 3 and 440,260.3333 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 | 1,320,781 | |
| -1 | -1,320,781 |
Let's try dividing by 4:
1,320,781 ÷ 4 = 330,195.25
If the quotient is a whole number, then 4 and 330,195.25 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 | 1,320,781 | |
| -1 | 1,320,781 |
If you did it right, you will end up with this table:
| 1 | 7 | 11 | 17 | 77 | 119 | 187 | 1,009 | 1,309 | 7,063 | 11,099 | 17,153 | 77,693 | 120,071 | 188,683 | 1,320,781 |
| -1 | -7 | -11 | -17 | -77 | -119 | -187 | -1,009 | -1,309 | -7,063 | -11,099 | -17,153 | -77,693 | -120,071 | -188,683 | -1,320,781 |
Here are some more numbers to try:
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