A:
Positive:
1 x 216660855 x 43332177 x 309515535 x 61903149 x 442165191 x 113435245 x 88433463 x 46795955 x 226871337 x 162052315 x 93593241 x 6685
Negative:
-1 x -21666085-5 x -4333217-7 x -3095155-35 x -619031-49 x -442165-191 x -113435-245 x -88433-463 x -46795-955 x -22687-1337 x -16205-2315 x -9359-3241 x -6685
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 21,666,085, 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 | 21,666,085 | |
| -1 | -21,666,085 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 21,666,085.
Example:
1 x 21,666,085 = 21,666,085
and
-1 x -21,666,085 = 21,666,085
Notice both answers equal 21,666,085
With that explanation out of the way, let's continue. Next, we take the number 21,666,085 and divide it by 2:
21,666,085 ÷ 2 = 10,833,042.5
If the quotient is a whole number, then 2 and 10,833,042.5 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 | 21,666,085 | |
| -1 | -21,666,085 |
Now, we try dividing 21,666,085 by 3:
21,666,085 ÷ 3 = 7,222,028.3333
If the quotient is a whole number, then 3 and 7,222,028.3333 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 | 21,666,085 | |
| -1 | -21,666,085 |
Let's try dividing by 4:
21,666,085 ÷ 4 = 5,416,521.25
If the quotient is a whole number, then 4 and 5,416,521.25 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 | 21,666,085 | |
| -1 | 21,666,085 |
If you did it right, you will end up with this table:
| 1 | 5 | 7 | 35 | 49 | 191 | 245 | 463 | 955 | 1,337 | 2,315 | 3,241 | 6,685 | 9,359 | 16,205 | 22,687 | 46,795 | 88,433 | 113,435 | 442,165 | 619,031 | 3,095,155 | 4,333,217 | 21,666,085 |
| -1 | -5 | -7 | -35 | -49 | -191 | -245 | -463 | -955 | -1,337 | -2,315 | -3,241 | -6,685 | -9,359 | -16,205 | -22,687 | -46,795 | -88,433 | -113,435 | -442,165 | -619,031 | -3,095,155 | -4,333,217 | -21,666,085 |
Here are some more numbers to try:
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