A:
Positive:
1 x 215654755 x 431309519 x 113502525 x 86261983 x 25982595 x 227005415 x 51965475 x 45401547 x 394251577 x 136752075 x 103932735 x 7885
Negative:
-1 x -21565475-5 x -4313095-19 x -1135025-25 x -862619-83 x -259825-95 x -227005-415 x -51965-475 x -45401-547 x -39425-1577 x -13675-2075 x -10393-2735 x -7885
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 21,565,475, 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 | 21,565,475 | |
| -1 | -21,565,475 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 21,565,475.
Example:
1 x 21,565,475 = 21,565,475
and
-1 x -21,565,475 = 21,565,475
Notice both answers equal 21,565,475
With that explanation out of the way, let's continue. Next, we take the number 21,565,475 and divide it by 2:
21,565,475 ÷ 2 = 10,782,737.5
If the quotient is a whole number, then 2 and 10,782,737.5 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 | 21,565,475 | |
| -1 | -21,565,475 |
Now, we try dividing 21,565,475 by 3:
21,565,475 ÷ 3 = 7,188,491.6667
If the quotient is a whole number, then 3 and 7,188,491.6667 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 | 21,565,475 | |
| -1 | -21,565,475 |
Let's try dividing by 4:
21,565,475 ÷ 4 = 5,391,368.75
If the quotient is a whole number, then 4 and 5,391,368.75 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 | 21,565,475 | |
| -1 | 21,565,475 |
If you did it right, you will end up with this table:
| 1 | 5 | 19 | 25 | 83 | 95 | 415 | 475 | 547 | 1,577 | 2,075 | 2,735 | 7,885 | 10,393 | 13,675 | 39,425 | 45,401 | 51,965 | 227,005 | 259,825 | 862,619 | 1,135,025 | 4,313,095 | 21,565,475 |
| -1 | -5 | -19 | -25 | -83 | -95 | -415 | -475 | -547 | -1,577 | -2,075 | -2,735 | -7,885 | -10,393 | -13,675 | -39,425 | -45,401 | -51,965 | -227,005 | -259,825 | -862,619 | -1,135,025 | -4,313,095 | -21,565,475 |
Here are some more numbers to try:
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