A:
Positive:
1 x 19684217 x 28120313 x 15141791 x 2163197 x 20293223 x 8827679 x 28991261 x 1561
Negative:
-1 x -1968421-7 x -281203-13 x -151417-91 x -21631-97 x -20293-223 x -8827-679 x -2899-1261 x -1561
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 1,968,421, 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 | 1,968,421 | |
| -1 | -1,968,421 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 1,968,421.
Example:
1 x 1,968,421 = 1,968,421
and
-1 x -1,968,421 = 1,968,421
Notice both answers equal 1,968,421
With that explanation out of the way, let's continue. Next, we take the number 1,968,421 and divide it by 2:
1,968,421 ÷ 2 = 984,210.5
If the quotient is a whole number, then 2 and 984,210.5 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 | 1,968,421 | |
| -1 | -1,968,421 |
Now, we try dividing 1,968,421 by 3:
1,968,421 ÷ 3 = 656,140.3333
If the quotient is a whole number, then 3 and 656,140.3333 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 | 1,968,421 | |
| -1 | -1,968,421 |
Let's try dividing by 4:
1,968,421 ÷ 4 = 492,105.25
If the quotient is a whole number, then 4 and 492,105.25 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 | 1,968,421 | |
| -1 | 1,968,421 |
If you did it right, you will end up with this table:
| 1 | 7 | 13 | 91 | 97 | 223 | 679 | 1,261 | 1,561 | 2,899 | 8,827 | 20,293 | 21,631 | 151,417 | 281,203 | 1,968,421 |
| -1 | -7 | -13 | -91 | -97 | -223 | -679 | -1,261 | -1,561 | -2,899 | -8,827 | -20,293 | -21,631 | -151,417 | -281,203 | -1,968,421 |
Here are some more numbers to try:
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