GCF for 20 and 785

What is the Greatest Common Factor of 20 and 785?

Answer: GCF of 20 and 785 is 5

(Five)

Finding GCF for 20 and 785 using all factors (divisors) listing

The first method to find GCF for numbers 20 and 785 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 785: 1, 5, 157, 785

So the Greatest Common Factor for 20 and 785 is 5

Finding GCF for 20 and 785 by Prime Factorization

The second method to find GCF for numbers 20 and 785 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 785: 5, 157

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 785

GCF Table

Number 1Number 2GCF
57855
67851
77851
87851
97851
107855
117851
127851
137851
147851
157855
167851
177851
187851
197851
207855
217851
227851
237851
247851
257855
267851
277851
287851
297851
307855
317851
327851
337851
347851

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 785? (The answer is: 5). Select the first number (e.g. '20') and the second number (e.g. '785'). 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 785?

GCF of 20 and 785 is 5