A:
Positive:
1 x 182118555 x 364237129 x 62799561 x 29855571 x 256505145 x 125599305 x 59711355 x 51301841 x 216551769 x 102952059 x 88454205 x 4331
Negative:
-1 x -18211855-5 x -3642371-29 x -627995-61 x -298555-71 x -256505-145 x -125599-305 x -59711-355 x -51301-841 x -21655-1769 x -10295-2059 x -8845-4205 x -4331
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 18,211,855, 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 | 18,211,855 | |
| -1 | -18,211,855 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 18,211,855.
Example:
1 x 18,211,855 = 18,211,855
and
-1 x -18,211,855 = 18,211,855
Notice both answers equal 18,211,855
With that explanation out of the way, let's continue. Next, we take the number 18,211,855 and divide it by 2:
18,211,855 ÷ 2 = 9,105,927.5
If the quotient is a whole number, then 2 and 9,105,927.5 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 | 18,211,855 | |
| -1 | -18,211,855 |
Now, we try dividing 18,211,855 by 3:
18,211,855 ÷ 3 = 6,070,618.3333
If the quotient is a whole number, then 3 and 6,070,618.3333 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 | 18,211,855 | |
| -1 | -18,211,855 |
Let's try dividing by 4:
18,211,855 ÷ 4 = 4,552,963.75
If the quotient is a whole number, then 4 and 4,552,963.75 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 | 18,211,855 | |
| -1 | 18,211,855 |
If you did it right, you will end up with this table:
| 1 | 5 | 29 | 61 | 71 | 145 | 305 | 355 | 841 | 1,769 | 2,059 | 4,205 | 4,331 | 8,845 | 10,295 | 21,655 | 51,301 | 59,711 | 125,599 | 256,505 | 298,555 | 627,995 | 3,642,371 | 18,211,855 |
| -1 | -5 | -29 | -61 | -71 | -145 | -305 | -355 | -841 | -1,769 | -2,059 | -4,205 | -4,331 | -8,845 | -10,295 | -21,655 | -51,301 | -59,711 | -125,599 | -256,505 | -298,555 | -627,995 | -3,642,371 | -18,211,855 |
Here are some more numbers to try:
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