GCF for 20 and 860

What is the Greatest Common Factor of 20 and 860?

Answer: GCF of 20 and 860 is 20

(Twenty)

Finding GCF for 20 and 860 using all factors (divisors) listing

The first method to find GCF for numbers 20 and 860 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 860: 1, 2, 4, 5, 10, 20, 43, 86, 172, 215, 430, 860

So the Greatest Common Factor for 20 and 860 is 20

Finding GCF for 20 and 860 by Prime Factorization

The second method to find GCF for numbers 20 and 860 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 860: 2, 2, 5, 43

As we can see there are Prime Factors common to both numbers: 2, 2, 5

Now we need to multiply them to find GCF: 2 × 2 × 5 = 20

GCF Table

Number 1Number 2GCF
58605
68602
78601
88604
98601
1086010
118601
128604
138601
148602
158605
168604
178601
188602
198601
2086020
218601
228602
238601
248604
258605
268602
278601
288604
298601
3086010
318601
328604
338601
348602

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 860? (The answer is: 20). Select the first number (e.g. '20') and the second number (e.g. '860'). 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 860?

GCF of 20 and 860 is 20