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GCF (HCF) of 20 and 155

"Greatest Common Factor" Calculator

What is the Greatest Common Divisor of 20 and 155?

Answer

GCF (HCF) of 20 and 155 is

5

Common factors: 1, 5

5 divides both: 20 ÷ 5 = 4, 155 ÷ 5 = 31 — and 4 and 31 share no factor but 1, so no larger number divides both.

20 = 2² × 5

155 = 5 × 31

Prime	20	155	Lowest power
2	2²	—	—
5	5	5	5
31	—	31	—

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

GCF = 5

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See Also

Least Common Multiple - Find the Least Common Multiple (LCM) of two numbers
Greatest Common Factor of 3 Numbers - Find the Greatest Common Factor (GCF) of three numbers
Least Common Multiple of 3 Numbers - Find the Least Common Multiple (LCM) of three numbers

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What is the GCF (HCF) of 20 and 155. The GCF of 20 and 155 is 5 — the biggest number that can divide both integers. Step-by-step GCF (GCD) calculation by factoring.

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GCF Table

Number 1	Number 2	GCF
20	44	4
20	45	5
20	47	1
20	48	4
20	50	10
20	55	5
20	56	4
20	58	2
20	59	1
20	60	20
20	70	10
20	75	5
20	84	4
20	90	10
20	100	20
20	155	5
20	165	5
20	190	10
20	205	5
20	230	10
20	235	5
20	250	10
20	305	5
20	385	5
20	430	10
20	450	10
20	460	20
20	465	5
20	470	10
20	480	20

FAQ

What is the Greatest Common Divisor of 20 and 155?

GCF (HCF) of 20 and 155 is 5

How to find the GCF of 20 and 155?

You can find the GCF of 20 and 155 by listing all factors of both numbers and picking the greatest common one, or by prime factorization. The GCF of 20 and 155 is 5.

What prime factors do 20 and 155 share?

The prime factorizations of 20 and 155 have 5 in common, and multiplying those shared primes gives 5 — exactly the greatest common factor.

How does the GCF reduce the fraction 20/155?

Divide the numerator and the denominator by the GCF 5: 20 ÷ 5 = 4 and 155 ÷ 5 = 31. So 20/155 in lowest terms is 4/31.