A:
Positive:
1 x 21818155 x 43636329 x 7523541 x 53215145 x 15047205 x 10643367 x 59451189 x 1835
Negative:
-1 x -2181815-5 x -436363-29 x -75235-41 x -53215-145 x -15047-205 x -10643-367 x -5945-1189 x -1835
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 2,181,815, 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 | 2,181,815 | |
| -1 | -2,181,815 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 2,181,815.
Example:
1 x 2,181,815 = 2,181,815
and
-1 x -2,181,815 = 2,181,815
Notice both answers equal 2,181,815
With that explanation out of the way, let's continue. Next, we take the number 2,181,815 and divide it by 2:
2,181,815 ÷ 2 = 1,090,907.5
If the quotient is a whole number, then 2 and 1,090,907.5 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 | 2,181,815 | |
| -1 | -2,181,815 |
Now, we try dividing 2,181,815 by 3:
2,181,815 ÷ 3 = 727,271.6667
If the quotient is a whole number, then 3 and 727,271.6667 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 | 2,181,815 | |
| -1 | -2,181,815 |
Let's try dividing by 4:
2,181,815 ÷ 4 = 545,453.75
If the quotient is a whole number, then 4 and 545,453.75 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 | 2,181,815 | |
| -1 | 2,181,815 |
If you did it right, you will end up with this table:
| 1 | 5 | 29 | 41 | 145 | 205 | 367 | 1,189 | 1,835 | 5,945 | 10,643 | 15,047 | 53,215 | 75,235 | 436,363 | 2,181,815 |
| -1 | -5 | -29 | -41 | -145 | -205 | -367 | -1,189 | -1,835 | -5,945 | -10,643 | -15,047 | -53,215 | -75,235 | -436,363 | -2,181,815 |
Here are some more numbers to try:
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