A:
Positive:
1 x 2078350313 x 159873117 x 1222559157 x 132379221 x 94043599 x 346972041 x 101832669 x 7787
Negative:
-1 x -20783503-13 x -1598731-17 x -1222559-157 x -132379-221 x -94043-599 x -34697-2041 x -10183-2669 x -7787
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 20,783,503, 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 | 20,783,503 | |
| -1 | -20,783,503 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 20,783,503.
Example:
1 x 20,783,503 = 20,783,503
and
-1 x -20,783,503 = 20,783,503
Notice both answers equal 20,783,503
With that explanation out of the way, let's continue. Next, we take the number 20,783,503 and divide it by 2:
20,783,503 ÷ 2 = 10,391,751.5
If the quotient is a whole number, then 2 and 10,391,751.5 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 | 20,783,503 | |
| -1 | -20,783,503 |
Now, we try dividing 20,783,503 by 3:
20,783,503 ÷ 3 = 6,927,834.3333
If the quotient is a whole number, then 3 and 6,927,834.3333 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 | 20,783,503 | |
| -1 | -20,783,503 |
Let's try dividing by 4:
20,783,503 ÷ 4 = 5,195,875.75
If the quotient is a whole number, then 4 and 5,195,875.75 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 | 20,783,503 | |
| -1 | 20,783,503 |
If you did it right, you will end up with this table:
| 1 | 13 | 17 | 157 | 221 | 599 | 2,041 | 2,669 | 7,787 | 10,183 | 34,697 | 94,043 | 132,379 | 1,222,559 | 1,598,731 | 20,783,503 |
| -1 | -13 | -17 | -157 | -221 | -599 | -2,041 | -2,669 | -7,787 | -10,183 | -34,697 | -94,043 | -132,379 | -1,222,559 | -1,598,731 | -20,783,503 |
Here are some more numbers to try:
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