GCF for 20 and 165

"Greatest Common Factor" Calculator

Greatest Common Factor of

and

What is the Greatest Common Divisor of 20 and 165?

Answer

GCF of 20 and 165 is 5

(Five)

Finding GCF for 20 and 165 using all factors (divisors) listing

The first method to find GCF for numbers 20 and 165 is to list all factors for both numbers and pick the highest common one:

All factors of 20: 1, 2, 4, 5, 10, 20

All factors of 165: 1, 3, 5, 11, 15, 33, 55, 165

So the Greatest Common Factor for 20 and 165 is 5

Finding GCF for 20 and 165 by Prime Factorization

The second method to find GCF for numbers 20 and 165 is to list all Prime Factors for both numbers and multiply the common ones:

All Prime Factors of 20: 2, 2, 5

All Prime Factors of 165: 3, 5, 11

As we can see there is only one Prime Factor common to both numbers. It is 5

So 5 is the Greatest Common Factor of 20 and 165

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About "Greatest Common Factor" Calculator

This calculator will help you find the greatest common factor (GCF) of two numbers. For example, it can help you find out what is the Greatest Common Divisor of 20 and 165? (The answer is: 5). Select the first number (e.g. '20') and the second number (e.g. '165'). After that hit the 'Calculate' button.
Greatest Common Factor (GCF) also known as the Greatest Common Divisor (GCD) or Highest Common Factor (HCF) - it is the largest positive integer that divides each of the integers with zero remainder.

"Greatest Common Factor" Calculator

Greatest Common Factor of

and

GCF Table

Number 1Number 2GCF
51655
61653
71651
81651
91653
101655
1116511
121653
131651
141651
1516515
161651
171651
181653
191651
201655
211653
2216511
231651
241653
251655
261651
271653
281651
291651
3016515
311651
321651
3316533
341651

FAQ

What is the Greatest Common Divisor of 20 and 165?

GCF of 20 and 165 is 5

How to find the GCF of 20 and 165?

You can find the GCF of 20 and 165 by listing all factors of both numbers and picking the greatest common one, or by prime factorization. The GCF of 20 and 165 is 5.

See Also