A:
Positive:
1 x 191456655 x 38291337 x 273509511 x 174051535 x 54701955 x 34810377 x 248645223 x 85855385 x 497291115 x 171711561 x 122652453 x 7805
Negative:
-1 x -19145665-5 x -3829133-7 x -2735095-11 x -1740515-35 x -547019-55 x -348103-77 x -248645-223 x -85855-385 x -49729-1115 x -17171-1561 x -12265-2453 x -7805
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 19,145,665, 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 | 19,145,665 | |
| -1 | -19,145,665 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 19,145,665.
Example:
1 x 19,145,665 = 19,145,665
and
-1 x -19,145,665 = 19,145,665
Notice both answers equal 19,145,665
With that explanation out of the way, let's continue. Next, we take the number 19,145,665 and divide it by 2:
19,145,665 ÷ 2 = 9,572,832.5
If the quotient is a whole number, then 2 and 9,572,832.5 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 | 19,145,665 | |
| -1 | -19,145,665 |
Now, we try dividing 19,145,665 by 3:
19,145,665 ÷ 3 = 6,381,888.3333
If the quotient is a whole number, then 3 and 6,381,888.3333 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 | 19,145,665 | |
| -1 | -19,145,665 |
Let's try dividing by 4:
19,145,665 ÷ 4 = 4,786,416.25
If the quotient is a whole number, then 4 and 4,786,416.25 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 | 19,145,665 | |
| -1 | 19,145,665 |
If you did it right, you will end up with this table:
| 1 | 5 | 7 | 11 | 35 | 55 | 77 | 223 | 385 | 1,115 | 1,561 | 2,453 | 7,805 | 12,265 | 17,171 | 49,729 | 85,855 | 248,645 | 348,103 | 547,019 | 1,740,515 | 2,735,095 | 3,829,133 | 19,145,665 |
| -1 | -5 | -7 | -11 | -35 | -55 | -77 | -223 | -385 | -1,115 | -1,561 | -2,453 | -7,805 | -12,265 | -17,171 | -49,729 | -85,855 | -248,645 | -348,103 | -547,019 | -1,740,515 | -2,735,095 | -3,829,133 | -19,145,665 |
Here are some more numbers to try:
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