GCF for 20 and 670

What is the Greatest Common Factor of 20 and 670?

Answer: GCF of 20 and 670 is 10

(Ten)

Finding GCF for 20 and 670 using all factors (divisors) listing

The first method to find GCF for numbers 20 and 670 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 670: 1, 2, 5, 10, 67, 134, 335, 670

So the Greatest Common Factor for 20 and 670 is 10

Finding GCF for 20 and 670 by Prime Factorization

The second method to find GCF for numbers 20 and 670 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 670: 2, 5, 67

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

Now we need to multiply them to find GCF: 2 × 5 = 10

GCF Table

Number 1Number 2GCF
56705
66702
76701
86702
96701
1067010
116701
126702
136701
146702
156705
166702
176701
186702
196701
2067010
216701
226702
236701
246702
256705
266702
276701
286702
296701
3067010
316701
326702
336701
346702

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 670? (The answer is: 10). Select the first number (e.g. '20') and the second number (e.g. '670'). 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 670?

GCF of 20 and 670 is 10