A:
Positive:
1 x 191788877 x 273984113 x 147529991 x 210757419 x 45773503 x 381292933 x 65393521 x 5447
Negative:
-1 x -19178887-7 x -2739841-13 x -1475299-91 x -210757-419 x -45773-503 x -38129-2933 x -6539-3521 x -5447
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 19,178,887, 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 | 19,178,887 | |
| -1 | -19,178,887 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 19,178,887.
Example:
1 x 19,178,887 = 19,178,887
and
-1 x -19,178,887 = 19,178,887
Notice both answers equal 19,178,887
With that explanation out of the way, let's continue. Next, we take the number 19,178,887 and divide it by 2:
19,178,887 ÷ 2 = 9,589,443.5
If the quotient is a whole number, then 2 and 9,589,443.5 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 | 19,178,887 | |
| -1 | -19,178,887 |
Now, we try dividing 19,178,887 by 3:
19,178,887 ÷ 3 = 6,392,962.3333
If the quotient is a whole number, then 3 and 6,392,962.3333 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 | 19,178,887 | |
| -1 | -19,178,887 |
Let's try dividing by 4:
19,178,887 ÷ 4 = 4,794,721.75
If the quotient is a whole number, then 4 and 4,794,721.75 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 | 19,178,887 | |
| -1 | 19,178,887 |
If you did it right, you will end up with this table:
| 1 | 7 | 13 | 91 | 419 | 503 | 2,933 | 3,521 | 5,447 | 6,539 | 38,129 | 45,773 | 210,757 | 1,475,299 | 2,739,841 | 19,178,887 |
| -1 | -7 | -13 | -91 | -419 | -503 | -2,933 | -3,521 | -5,447 | -6,539 | -38,129 | -45,773 | -210,757 | -1,475,299 | -2,739,841 | -19,178,887 |
Here are some more numbers to try:
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