A:
Positive:
1 x 217518855 x 435037729 x 75006567 x 324655145 x 150013335 x 649311943 x 111952239 x 9715
Negative:
-1 x -21751885-5 x -4350377-29 x -750065-67 x -324655-145 x -150013-335 x -64931-1943 x -11195-2239 x -9715
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 21,751,885, 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 | 21,751,885 | |
| -1 | -21,751,885 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 21,751,885.
Example:
1 x 21,751,885 = 21,751,885
and
-1 x -21,751,885 = 21,751,885
Notice both answers equal 21,751,885
With that explanation out of the way, let's continue. Next, we take the number 21,751,885 and divide it by 2:
21,751,885 ÷ 2 = 10,875,942.5
If the quotient is a whole number, then 2 and 10,875,942.5 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 | 21,751,885 | |
| -1 | -21,751,885 |
Now, we try dividing 21,751,885 by 3:
21,751,885 ÷ 3 = 7,250,628.3333
If the quotient is a whole number, then 3 and 7,250,628.3333 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 | 21,751,885 | |
| -1 | -21,751,885 |
Let's try dividing by 4:
21,751,885 ÷ 4 = 5,437,971.25
If the quotient is a whole number, then 4 and 5,437,971.25 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 | 21,751,885 | |
| -1 | 21,751,885 |
If you did it right, you will end up with this table:
| 1 | 5 | 29 | 67 | 145 | 335 | 1,943 | 2,239 | 9,715 | 11,195 | 64,931 | 150,013 | 324,655 | 750,065 | 4,350,377 | 21,751,885 |
| -1 | -5 | -29 | -67 | -145 | -335 | -1,943 | -2,239 | -9,715 | -11,195 | -64,931 | -150,013 | -324,655 | -750,065 | -4,350,377 | -21,751,885 |
Here are some more numbers to try:
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