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A number is called a factor of another number, if it can divide that another number exactly by leaving a remainder ‘0’. Common factor between two or more given numbers is the number which can exactly divide all the given numbers. Common factor calculator is the quick online tool helpful in finding the common factors for given numbers.

**Example 1: Find the common factor of the given numbers, 12, 16, and 20.**

In order to find the common factor for the given set of numbers, we have to first find their individual factors and then pick the common numbers out of them.

Factors of 12 = **1, 2**, 3, **4,** 6, 12

Factors of 16 = **1, 2, 4**, 8, 16

Factors of 20 = **1, 2, 4**, 5, 10, 20

**Common factors of 12, 16 and 20 = 1, 2 and 4**

**Example 2: Find the common factor of the given numbers, 15, 27 and 32. **

In order to find the common factor for the given set of numbers, we have to first find their individual factors and then pick the common numbers out of them.

Factors of 15 = **1, 3**, 5, 15

Factors of 27 = **1, 3**, 9, 27

Factors of 36 = **1**, 2, **3,** 4, 6, 9, 12, 18, 36

**Common factors of 15, 27 and 32 = 1 and 3**