GCF (HCF) of 20 and 480

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What is the Greatest Common Divisor of 20 and 480?

Answer

GCF (HCF) of 20 and 480 is
20

Common factors: 1, 2, 4, 5, 10, 20

20 divides 480 (480 ÷ 20 = 24), so the GCF is the smaller number itself.

20 = 22 × 5

480 = 25 × 3 × 5

Prime20480Lowest power
2222522
3—3—
5555

— = power 0: the prime is not a factor of this number, so it cannot be in the GCF.

GCF = 22 × 5 = 20

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GCF Table

Number 1Number 2GCF
20444
20455
20471
20484
205010
20555
20564
20582
20591
206020
207010
20755
20844
209010
2010020
201555
201655
2019010
202055
2023010
202355
2025010
203055
2043010
2045010
2046020
204655
2047010
2048020
2049010

FAQ

What is the Greatest Common Divisor of 20 and 480?

GCF (HCF) of 20 and 480 is 20

How to find the GCF of 20 and 480?

You can find the GCF of 20 and 480 by listing all factors of both numbers and picking the greatest common one, or by prime factorization. The GCF of 20 and 480 is 20.

What prime factors do 20 and 480 share?

The prime factorizations of 20 and 480 have 2 × 2 × 5 in common, and multiplying those shared primes gives 20 — exactly the greatest common factor.

How does the GCF reduce the fraction 20/480?

Divide the numerator and the denominator by the GCF 20: 20 ÷ 20 = 1 and 480 ÷ 20 = 24. So 20/480 in lowest terms is 1/24.

See Also