A:
Positive:
1 x 198169797 x 283099713 x 152438359 x 33588191 x 217769413 x 47983767 x 258373691 x 5369
Negative:
-1 x -19816979-7 x -2830997-13 x -1524383-59 x -335881-91 x -217769-413 x -47983-767 x -25837-3691 x -5369
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 19,816,979, 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 | 19,816,979 | |
| -1 | -19,816,979 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 19,816,979.
Example:
1 x 19,816,979 = 19,816,979
and
-1 x -19,816,979 = 19,816,979
Notice both answers equal 19,816,979
With that explanation out of the way, let's continue. Next, we take the number 19,816,979 and divide it by 2:
19,816,979 ÷ 2 = 9,908,489.5
If the quotient is a whole number, then 2 and 9,908,489.5 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 | 19,816,979 | |
| -1 | -19,816,979 |
Now, we try dividing 19,816,979 by 3:
19,816,979 ÷ 3 = 6,605,659.6667
If the quotient is a whole number, then 3 and 6,605,659.6667 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 | 19,816,979 | |
| -1 | -19,816,979 |
Let's try dividing by 4:
19,816,979 ÷ 4 = 4,954,244.75
If the quotient is a whole number, then 4 and 4,954,244.75 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 | 19,816,979 | |
| -1 | 19,816,979 |
If you did it right, you will end up with this table:
| 1 | 7 | 13 | 59 | 91 | 413 | 767 | 3,691 | 5,369 | 25,837 | 47,983 | 217,769 | 335,881 | 1,524,383 | 2,830,997 | 19,816,979 |
| -1 | -7 | -13 | -59 | -91 | -413 | -767 | -3,691 | -5,369 | -25,837 | -47,983 | -217,769 | -335,881 | -1,524,383 | -2,830,997 | -19,816,979 |
Here are some more numbers to try:
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