A:
Positive:
1 x 191211655 x 38242337 x 273159523 x 83135535 x 546319115 x 166271161 x 118765805 x 23753
Negative:
-1 x -19121165-5 x -3824233-7 x -2731595-23 x -831355-35 x -546319-115 x -166271-161 x -118765-805 x -23753
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 19,121,165, 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 | 19,121,165 | |
| -1 | -19,121,165 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 19,121,165.
Example:
1 x 19,121,165 = 19,121,165
and
-1 x -19,121,165 = 19,121,165
Notice both answers equal 19,121,165
With that explanation out of the way, let's continue. Next, we take the number 19,121,165 and divide it by 2:
19,121,165 ÷ 2 = 9,560,582.5
If the quotient is a whole number, then 2 and 9,560,582.5 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 | 19,121,165 | |
| -1 | -19,121,165 |
Now, we try dividing 19,121,165 by 3:
19,121,165 ÷ 3 = 6,373,721.6667
If the quotient is a whole number, then 3 and 6,373,721.6667 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 | 19,121,165 | |
| -1 | -19,121,165 |
Let's try dividing by 4:
19,121,165 ÷ 4 = 4,780,291.25
If the quotient is a whole number, then 4 and 4,780,291.25 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 | 19,121,165 | |
| -1 | 19,121,165 |
If you did it right, you will end up with this table:
| 1 | 5 | 7 | 23 | 35 | 115 | 161 | 805 | 23,753 | 118,765 | 166,271 | 546,319 | 831,355 | 2,731,595 | 3,824,233 | 19,121,165 |
| -1 | -5 | -7 | -23 | -35 | -115 | -161 | -805 | -23,753 | -118,765 | -166,271 | -546,319 | -831,355 | -2,731,595 | -3,824,233 | -19,121,165 |
Here are some more numbers to try:
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