Use Factoring Numbers Calculator to find out if a number entered is odd or even and the factors of that number.

Warning: This is very processor intensive, do not enter a large number.

The fundamental theorem of arithmetic indicates that any natural number greater than or equal to two can be factored into a product of primes. This decomposition into a product of prime factors for integers is the "best" possible factorization, which makes it possible to perform numerous calculations: simplifications of fractions, determination of GCD, LCM, roots, and so on.

To factoring in general, it may be interesting to use the tree of factors to prevent the forgetting factors.

1. Place the number to be factored at the top of the tree and break it down into two factors that will be written at the end of two branches.

2. If one or both factors are not prime, continue factoring until all the factors at the ends of the branches are prime.

3. Write the number as a product of prime factors using the factors at the ends of the branches of the tree.

The factors of 15 are: 1, 3, 5, 15

The factors of 16 are: 1, 2, 4, 8, 16

The factors of 16 are: 1, 2, 3, 4, 6, 9, 12, 18, 36

1 is the smallest factor of 15.

The common factors of 15 and 30 are 1, 3, 5, and 15.

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