A:
Positive:
1 x 21532155 x 43064337 x 58195103 x 20905113 x 19055185 x 11639515 x 4181565 x 3811
Negative:
-1 x -2153215-5 x -430643-37 x -58195-103 x -20905-113 x -19055-185 x -11639-515 x -4181-565 x -3811
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 2,153,215, 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 | 2,153,215 | |
| -1 | -2,153,215 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 2,153,215.
Example:
1 x 2,153,215 = 2,153,215
and
-1 x -2,153,215 = 2,153,215
Notice both answers equal 2,153,215
With that explanation out of the way, let's continue. Next, we take the number 2,153,215 and divide it by 2:
2,153,215 ÷ 2 = 1,076,607.5
If the quotient is a whole number, then 2 and 1,076,607.5 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 | 2,153,215 | |
| -1 | -2,153,215 |
Now, we try dividing 2,153,215 by 3:
2,153,215 ÷ 3 = 717,738.3333
If the quotient is a whole number, then 3 and 717,738.3333 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 | 2,153,215 | |
| -1 | -2,153,215 |
Let's try dividing by 4:
2,153,215 ÷ 4 = 538,303.75
If the quotient is a whole number, then 4 and 538,303.75 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 | 2,153,215 | |
| -1 | 2,153,215 |
If you did it right, you will end up with this table:
| 1 | 5 | 37 | 103 | 113 | 185 | 515 | 565 | 3,811 | 4,181 | 11,639 | 19,055 | 20,905 | 58,195 | 430,643 | 2,153,215 |
| -1 | -5 | -37 | -103 | -113 | -185 | -515 | -565 | -3,811 | -4,181 | -11,639 | -19,055 | -20,905 | -58,195 | -430,643 | -2,153,215 |
Here are some more numbers to try:
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