A:
Positive:
1 x 217608055 x 435216111 x 197825555 x 395651173 x 125785865 x 251571903 x 114352287 x 9515
Negative:
-1 x -21760805-5 x -4352161-11 x -1978255-55 x -395651-173 x -125785-865 x -25157-1903 x -11435-2287 x -9515
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 21,760,805, 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 | 21,760,805 | |
| -1 | -21,760,805 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 21,760,805.
Example:
1 x 21,760,805 = 21,760,805
and
-1 x -21,760,805 = 21,760,805
Notice both answers equal 21,760,805
With that explanation out of the way, let's continue. Next, we take the number 21,760,805 and divide it by 2:
21,760,805 ÷ 2 = 10,880,402.5
If the quotient is a whole number, then 2 and 10,880,402.5 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 | 21,760,805 | |
| -1 | -21,760,805 |
Now, we try dividing 21,760,805 by 3:
21,760,805 ÷ 3 = 7,253,601.6667
If the quotient is a whole number, then 3 and 7,253,601.6667 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 | 21,760,805 | |
| -1 | -21,760,805 |
Let's try dividing by 4:
21,760,805 ÷ 4 = 5,440,201.25
If the quotient is a whole number, then 4 and 5,440,201.25 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 | 21,760,805 | |
| -1 | 21,760,805 |
If you did it right, you will end up with this table:
| 1 | 5 | 11 | 55 | 173 | 865 | 1,903 | 2,287 | 9,515 | 11,435 | 25,157 | 125,785 | 395,651 | 1,978,255 | 4,352,161 | 21,760,805 |
| -1 | -5 | -11 | -55 | -173 | -865 | -1,903 | -2,287 | -9,515 | -11,435 | -25,157 | -125,785 | -395,651 | -1,978,255 | -4,352,161 | -21,760,805 |
Here are some more numbers to try:
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