A:
Positive:
1 x 19906817 x 28438311 x 18097177 x 25853103 x 19327251 x 7931721 x 27611133 x 1757
Negative:
-1 x -1990681-7 x -284383-11 x -180971-77 x -25853-103 x -19327-251 x -7931-721 x -2761-1133 x -1757
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 1,990,681, 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 | 1,990,681 | |
| -1 | -1,990,681 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 1,990,681.
Example:
1 x 1,990,681 = 1,990,681
and
-1 x -1,990,681 = 1,990,681
Notice both answers equal 1,990,681
With that explanation out of the way, let's continue. Next, we take the number 1,990,681 and divide it by 2:
1,990,681 ÷ 2 = 995,340.5
If the quotient is a whole number, then 2 and 995,340.5 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 | 1,990,681 | |
| -1 | -1,990,681 |
Now, we try dividing 1,990,681 by 3:
1,990,681 ÷ 3 = 663,560.3333
If the quotient is a whole number, then 3 and 663,560.3333 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 | 1,990,681 | |
| -1 | -1,990,681 |
Let's try dividing by 4:
1,990,681 ÷ 4 = 497,670.25
If the quotient is a whole number, then 4 and 497,670.25 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 | 1,990,681 | |
| -1 | 1,990,681 |
If you did it right, you will end up with this table:
| 1 | 7 | 11 | 77 | 103 | 251 | 721 | 1,133 | 1,757 | 2,761 | 7,931 | 19,327 | 25,853 | 180,971 | 284,383 | 1,990,681 |
| -1 | -7 | -11 | -77 | -103 | -251 | -721 | -1,133 | -1,757 | -2,761 | -7,931 | -19,327 | -25,853 | -180,971 | -284,383 | -1,990,681 |
Here are some more numbers to try:
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