16 doesn't have a GCF. You need at least two numbers to find one of those. If you're asking what three numbers equal 16, there are an infinite number of possibilities. If you're asking what three numbers have a GCF of 16, 16, 32 and 48 is one answer.
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Common Factors: 14,7,2,1 Greatest Common Factor: 14
8 and 16, among others.
There cannot be a greatest common factor of just one number. To be common there need to be at least two numbers. If you find all the factors of two or more numbers, and you find some factors are the same ("common"), then the largest of those common factors is the Greatest Common Factor.
The greatest common factor (GCF) is often also called the greatest common divisor (GCD) or highest common factor (HCF). Keep in mind that these different terms all refer to the same thing: the largest integer which evenly divides two or more numbers.The greatest common factor of 40 and 140 is 20