A:
Positive:
1 x 217723855 x 435447719 x 114591531 x 70233595 x 229183155 x 140467589 x 369652945 x 7393
Negative:
-1 x -21772385-5 x -4354477-19 x -1145915-31 x -702335-95 x -229183-155 x -140467-589 x -36965-2945 x -7393
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 21,772,385, 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 | 21,772,385 | |
| -1 | -21,772,385 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 21,772,385.
Example:
1 x 21,772,385 = 21,772,385
and
-1 x -21,772,385 = 21,772,385
Notice both answers equal 21,772,385
With that explanation out of the way, let's continue. Next, we take the number 21,772,385 and divide it by 2:
21,772,385 ÷ 2 = 10,886,192.5
If the quotient is a whole number, then 2 and 10,886,192.5 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 | 21,772,385 | |
| -1 | -21,772,385 |
Now, we try dividing 21,772,385 by 3:
21,772,385 ÷ 3 = 7,257,461.6667
If the quotient is a whole number, then 3 and 7,257,461.6667 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 | 21,772,385 | |
| -1 | -21,772,385 |
Let's try dividing by 4:
21,772,385 ÷ 4 = 5,443,096.25
If the quotient is a whole number, then 4 and 5,443,096.25 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 | 21,772,385 | |
| -1 | 21,772,385 |
If you did it right, you will end up with this table:
| 1 | 5 | 19 | 31 | 95 | 155 | 589 | 2,945 | 7,393 | 36,965 | 140,467 | 229,183 | 702,335 | 1,145,915 | 4,354,477 | 21,772,385 |
| -1 | -5 | -19 | -31 | -95 | -155 | -589 | -2,945 | -7,393 | -36,965 | -140,467 | -229,183 | -702,335 | -1,145,915 | -4,354,477 | -21,772,385 |
Here are some more numbers to try:
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