A:
Positive:
1 x 2177706713 x 167515923 x 946829173 x 125879299 x 72833421 x 517272249 x 96833979 x 5473
Negative:
-1 x -21777067-13 x -1675159-23 x -946829-173 x -125879-299 x -72833-421 x -51727-2249 x -9683-3979 x -5473
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 21,777,067, 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 | 21,777,067 | |
| -1 | -21,777,067 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 21,777,067.
Example:
1 x 21,777,067 = 21,777,067
and
-1 x -21,777,067 = 21,777,067
Notice both answers equal 21,777,067
With that explanation out of the way, let's continue. Next, we take the number 21,777,067 and divide it by 2:
21,777,067 ÷ 2 = 10,888,533.5
If the quotient is a whole number, then 2 and 10,888,533.5 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 | 21,777,067 | |
| -1 | -21,777,067 |
Now, we try dividing 21,777,067 by 3:
21,777,067 ÷ 3 = 7,259,022.3333
If the quotient is a whole number, then 3 and 7,259,022.3333 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 | 21,777,067 | |
| -1 | -21,777,067 |
Let's try dividing by 4:
21,777,067 ÷ 4 = 5,444,266.75
If the quotient is a whole number, then 4 and 5,444,266.75 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 | 21,777,067 | |
| -1 | 21,777,067 |
If you did it right, you will end up with this table:
| 1 | 13 | 23 | 173 | 299 | 421 | 2,249 | 3,979 | 5,473 | 9,683 | 51,727 | 72,833 | 125,879 | 946,829 | 1,675,159 | 21,777,067 |
| -1 | -13 | -23 | -173 | -299 | -421 | -2,249 | -3,979 | -5,473 | -9,683 | -51,727 | -72,833 | -125,879 | -946,829 | -1,675,159 | -21,777,067 |
Here are some more numbers to try:
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