A:
Positive:
1 x 218858155 x 43771637 x 312654519 x 115188535 x 62530995 x 230377133 x 164555665 x 32911
Negative:
-1 x -21885815-5 x -4377163-7 x -3126545-19 x -1151885-35 x -625309-95 x -230377-133 x -164555-665 x -32911
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 21,885,815, 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 | 21,885,815 | |
| -1 | -21,885,815 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 21,885,815.
Example:
1 x 21,885,815 = 21,885,815
and
-1 x -21,885,815 = 21,885,815
Notice both answers equal 21,885,815
With that explanation out of the way, let's continue. Next, we take the number 21,885,815 and divide it by 2:
21,885,815 ÷ 2 = 10,942,907.5
If the quotient is a whole number, then 2 and 10,942,907.5 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 | 21,885,815 | |
| -1 | -21,885,815 |
Now, we try dividing 21,885,815 by 3:
21,885,815 ÷ 3 = 7,295,271.6667
If the quotient is a whole number, then 3 and 7,295,271.6667 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 | 21,885,815 | |
| -1 | -21,885,815 |
Let's try dividing by 4:
21,885,815 ÷ 4 = 5,471,453.75
If the quotient is a whole number, then 4 and 5,471,453.75 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 | 21,885,815 | |
| -1 | 21,885,815 |
If you did it right, you will end up with this table:
| 1 | 5 | 7 | 19 | 35 | 95 | 133 | 665 | 32,911 | 164,555 | 230,377 | 625,309 | 1,151,885 | 3,126,545 | 4,377,163 | 21,885,815 |
| -1 | -5 | -7 | -19 | -35 | -95 | -133 | -665 | -32,911 | -164,555 | -230,377 | -625,309 | -1,151,885 | -3,126,545 | -4,377,163 | -21,885,815 |
Here are some more numbers to try:
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