A:
Positive:
1 x 2061115111 x 187374123 x 89613741 x 502711253 x 81467451 x 45701943 x 218571987 x 10373
Negative:
-1 x -20611151-11 x -1873741-23 x -896137-41 x -502711-253 x -81467-451 x -45701-943 x -21857-1987 x -10373
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 20,611,151, 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 | 20,611,151 | |
| -1 | -20,611,151 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 20,611,151.
Example:
1 x 20,611,151 = 20,611,151
and
-1 x -20,611,151 = 20,611,151
Notice both answers equal 20,611,151
With that explanation out of the way, let's continue. Next, we take the number 20,611,151 and divide it by 2:
20,611,151 ÷ 2 = 10,305,575.5
If the quotient is a whole number, then 2 and 10,305,575.5 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 | 20,611,151 | |
| -1 | -20,611,151 |
Now, we try dividing 20,611,151 by 3:
20,611,151 ÷ 3 = 6,870,383.6667
If the quotient is a whole number, then 3 and 6,870,383.6667 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 | 20,611,151 | |
| -1 | -20,611,151 |
Let's try dividing by 4:
20,611,151 ÷ 4 = 5,152,787.75
If the quotient is a whole number, then 4 and 5,152,787.75 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 | 20,611,151 | |
| -1 | 20,611,151 |
If you did it right, you will end up with this table:
| 1 | 11 | 23 | 41 | 253 | 451 | 943 | 1,987 | 10,373 | 21,857 | 45,701 | 81,467 | 502,711 | 896,137 | 1,873,741 | 20,611,151 |
| -1 | -11 | -23 | -41 | -253 | -451 | -943 | -1,987 | -10,373 | -21,857 | -45,701 | -81,467 | -502,711 | -896,137 | -1,873,741 | -20,611,151 |
Here are some more numbers to try:
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