A:
Positive:
1 x 215562055 x 431124111 x 195965555 x 391931337 x 639651163 x 185351685 x 127933707 x 5815
Negative:
-1 x -21556205-5 x -4311241-11 x -1959655-55 x -391931-337 x -63965-1163 x -18535-1685 x -12793-3707 x -5815
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 21,556,205, 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 | 21,556,205 | |
| -1 | -21,556,205 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 21,556,205.
Example:
1 x 21,556,205 = 21,556,205
and
-1 x -21,556,205 = 21,556,205
Notice both answers equal 21,556,205
With that explanation out of the way, let's continue. Next, we take the number 21,556,205 and divide it by 2:
21,556,205 ÷ 2 = 10,778,102.5
If the quotient is a whole number, then 2 and 10,778,102.5 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 | 21,556,205 | |
| -1 | -21,556,205 |
Now, we try dividing 21,556,205 by 3:
21,556,205 ÷ 3 = 7,185,401.6667
If the quotient is a whole number, then 3 and 7,185,401.6667 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 | 21,556,205 | |
| -1 | -21,556,205 |
Let's try dividing by 4:
21,556,205 ÷ 4 = 5,389,051.25
If the quotient is a whole number, then 4 and 5,389,051.25 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 | 21,556,205 | |
| -1 | 21,556,205 |
If you did it right, you will end up with this table:
| 1 | 5 | 11 | 55 | 337 | 1,163 | 1,685 | 3,707 | 5,815 | 12,793 | 18,535 | 63,965 | 391,931 | 1,959,655 | 4,311,241 | 21,556,205 |
| -1 | -5 | -11 | -55 | -337 | -1,163 | -1,685 | -3,707 | -5,815 | -12,793 | -18,535 | -63,965 | -391,931 | -1,959,655 | -4,311,241 | -21,556,205 |
Here are some more numbers to try:
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