GCF for 20 and 515

What is the Greatest Common Factor of 20 and 515?

Answer: GCF of 20 and 515 is 5

(Five)

Finding GCF for 20 and 515 using all factors (divisors) listing

The first method to find GCF for numbers 20 and 515 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 515: 1, 5, 103, 515

So the Greatest Common Factor for 20 and 515 is 5

Finding GCF for 20 and 515 by Prime Factorization

The second method to find GCF for numbers 20 and 515 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 515: 5, 103

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 515

GCF Table

Number 1Number 2GCF
55155
65151
75151
85151
95151
105155
115151
125151
135151
145151
155155
165151
175151
185151
195151
205155
215151
225151
235151
245151
255155
265151
275151
285151
295151
305155
315151
325151
335151
345151

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 Factor of 20 and 515? (The answer is: 5). Select the first number (e.g. '20') and the second number (e.g. '515'). 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

FAQ

What is the Greatest Common Factor of 20 and 515?

GCF of 20 and 515 is 5