A:
Positive:
1 x 200216455 x 40043297 x 286023535 x 57204749 x 40860571 x 281995245 x 81721355 x 56399497 x 402851151 x 173952485 x 80573479 x 5755
Negative:
-1 x -20021645-5 x -4004329-7 x -2860235-35 x -572047-49 x -408605-71 x -281995-245 x -81721-355 x -56399-497 x -40285-1151 x -17395-2485 x -8057-3479 x -5755
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 20,021,645, 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 | 20,021,645 | |
| -1 | -20,021,645 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 20,021,645.
Example:
1 x 20,021,645 = 20,021,645
and
-1 x -20,021,645 = 20,021,645
Notice both answers equal 20,021,645
With that explanation out of the way, let's continue. Next, we take the number 20,021,645 and divide it by 2:
20,021,645 ÷ 2 = 10,010,822.5
If the quotient is a whole number, then 2 and 10,010,822.5 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 | 20,021,645 | |
| -1 | -20,021,645 |
Now, we try dividing 20,021,645 by 3:
20,021,645 ÷ 3 = 6,673,881.6667
If the quotient is a whole number, then 3 and 6,673,881.6667 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 | 20,021,645 | |
| -1 | -20,021,645 |
Let's try dividing by 4:
20,021,645 ÷ 4 = 5,005,411.25
If the quotient is a whole number, then 4 and 5,005,411.25 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 | 20,021,645 | |
| -1 | 20,021,645 |
If you did it right, you will end up with this table:
| 1 | 5 | 7 | 35 | 49 | 71 | 245 | 355 | 497 | 1,151 | 2,485 | 3,479 | 5,755 | 8,057 | 17,395 | 40,285 | 56,399 | 81,721 | 281,995 | 408,605 | 572,047 | 2,860,235 | 4,004,329 | 20,021,645 |
| -1 | -5 | -7 | -35 | -49 | -71 | -245 | -355 | -497 | -1,151 | -2,485 | -3,479 | -5,755 | -8,057 | -17,395 | -40,285 | -56,399 | -81,721 | -281,995 | -408,605 | -572,047 | -2,860,235 | -4,004,329 | -20,021,645 |
Here are some more numbers to try:
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