A:
Positive:
1 x 218675155 x 437350373 x 299555181 x 120815331 x 66065365 x 59911905 x 241631655 x 13213
Negative:
-1 x -21867515-5 x -4373503-73 x -299555-181 x -120815-331 x -66065-365 x -59911-905 x -24163-1655 x -13213
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 21,867,515, 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 | 21,867,515 | |
| -1 | -21,867,515 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 21,867,515.
Example:
1 x 21,867,515 = 21,867,515
and
-1 x -21,867,515 = 21,867,515
Notice both answers equal 21,867,515
With that explanation out of the way, let's continue. Next, we take the number 21,867,515 and divide it by 2:
21,867,515 ÷ 2 = 10,933,757.5
If the quotient is a whole number, then 2 and 10,933,757.5 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 | 21,867,515 | |
| -1 | -21,867,515 |
Now, we try dividing 21,867,515 by 3:
21,867,515 ÷ 3 = 7,289,171.6667
If the quotient is a whole number, then 3 and 7,289,171.6667 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 | 21,867,515 | |
| -1 | -21,867,515 |
Let's try dividing by 4:
21,867,515 ÷ 4 = 5,466,878.75
If the quotient is a whole number, then 4 and 5,466,878.75 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 | 21,867,515 | |
| -1 | 21,867,515 |
If you did it right, you will end up with this table:
| 1 | 5 | 73 | 181 | 331 | 365 | 905 | 1,655 | 13,213 | 24,163 | 59,911 | 66,065 | 120,815 | 299,555 | 4,373,503 | 21,867,515 |
| -1 | -5 | -73 | -181 | -331 | -365 | -905 | -1,655 | -13,213 | -24,163 | -59,911 | -66,065 | -120,815 | -299,555 | -4,373,503 | -21,867,515 |
Here are some more numbers to try:
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