A:
Positive:
1 x 215738655 x 4314773103 x 209455163 x 132355257 x 83945515 x 41891815 x 264711285 x 16789
Negative:
-1 x -21573865-5 x -4314773-103 x -209455-163 x -132355-257 x -83945-515 x -41891-815 x -26471-1285 x -16789
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 21,573,865, 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 | 21,573,865 | |
| -1 | -21,573,865 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 21,573,865.
Example:
1 x 21,573,865 = 21,573,865
and
-1 x -21,573,865 = 21,573,865
Notice both answers equal 21,573,865
With that explanation out of the way, let's continue. Next, we take the number 21,573,865 and divide it by 2:
21,573,865 ÷ 2 = 10,786,932.5
If the quotient is a whole number, then 2 and 10,786,932.5 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 | 21,573,865 | |
| -1 | -21,573,865 |
Now, we try dividing 21,573,865 by 3:
21,573,865 ÷ 3 = 7,191,288.3333
If the quotient is a whole number, then 3 and 7,191,288.3333 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 | 21,573,865 | |
| -1 | -21,573,865 |
Let's try dividing by 4:
21,573,865 ÷ 4 = 5,393,466.25
If the quotient is a whole number, then 4 and 5,393,466.25 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 | 21,573,865 | |
| -1 | 21,573,865 |
If you did it right, you will end up with this table:
| 1 | 5 | 103 | 163 | 257 | 515 | 815 | 1,285 | 16,789 | 26,471 | 41,891 | 83,945 | 132,355 | 209,455 | 4,314,773 | 21,573,865 |
| -1 | -5 | -103 | -163 | -257 | -515 | -815 | -1,285 | -16,789 | -26,471 | -41,891 | -83,945 | -132,355 | -209,455 | -4,314,773 | -21,573,865 |
Here are some more numbers to try:
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