GCF for 20 and 865

What is the Greatest Common Factor of 20 and 865?

Answer: GCF of 20 and 865 is 5

(Five)

Finding GCF for 20 and 865 using all factors (divisors) listing

The first method to find GCF for numbers 20 and 865 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 865: 1, 5, 173, 865

So the Greatest Common Factor for 20 and 865 is 5

Finding GCF for 20 and 865 by Prime Factorization

The second method to find GCF for numbers 20 and 865 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 865: 5, 173

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 865

GCF Table

Number 1Number 2GCF
58655
68651
78651
88651
98651
108655
118651
128651
138651
148651
158655
168651
178651
188651
198651
208655
218651
228651
238651
248651
258655
268651
278651
288651
298651
308655
318651
328651
338651
348651

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 865? (The answer is: 5). Select the first number (e.g. '20') and the second number (e.g. '865'). 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 865?

GCF of 20 and 865 is 5