A:
Positive:
1 x 19874059711 x 1806732731 x 6410987341 x 582817491 x 4047671187 x 1674315401 x 3679713057 x 15221
Negative:
-1 x -198740597-11 x -18067327-31 x -6410987-341 x -582817-491 x -404767-1187 x -167431-5401 x -36797-13057 x -15221
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 198,740,597, 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 | 198,740,597 | |
| -1 | -198,740,597 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 198,740,597.
Example:
1 x 198,740,597 = 198,740,597
and
-1 x -198,740,597 = 198,740,597
Notice both answers equal 198,740,597
With that explanation out of the way, let's continue. Next, we take the number 198,740,597 and divide it by 2:
198,740,597 ÷ 2 = 99,370,298.5
If the quotient is a whole number, then 2 and 99,370,298.5 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 | 198,740,597 | |
| -1 | -198,740,597 |
Now, we try dividing 198,740,597 by 3:
198,740,597 ÷ 3 = 66,246,865.6667
If the quotient is a whole number, then 3 and 66,246,865.6667 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 | 198,740,597 | |
| -1 | -198,740,597 |
Let's try dividing by 4:
198,740,597 ÷ 4 = 49,685,149.25
If the quotient is a whole number, then 4 and 49,685,149.25 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 | 198,740,597 | |
| -1 | 198,740,597 |
If you did it right, you will end up with this table:
| 1 | 11 | 31 | 341 | 491 | 1,187 | 5,401 | 13,057 | 15,221 | 36,797 | 167,431 | 404,767 | 582,817 | 6,410,987 | 18,067,327 | 198,740,597 |
| -1 | -11 | -31 | -341 | -491 | -1,187 | -5,401 | -13,057 | -15,221 | -36,797 | -167,431 | -404,767 | -582,817 | -6,410,987 | -18,067,327 | -198,740,597 |
Here are some more numbers to try:
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