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GCF (HCF) of 20 and 39

"Greatest Common Factor" Calculator

What is the Greatest Common Divisor of 20 and 39?

Answer

GCF (HCF) of 20 and 39 is

1

Common factors: 1

Only 1 divides both: 20 and 39 share no prime factor.

Such numbers are called coprime (relatively prime); their LCM is just the product: 20 × 39 = 780.

20 = 2² × 5

39 = 3 × 13

Prime	20	39	Lowest power
2	2²	—	—
3	—	3	—
5	5	—	—
13	—	13	—

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

GCF = 1

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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 39. The GCF of 20 and 39 is 1 — 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	12	4
20	15	5
20	21	1
20	22	2
20	23	1
20	24	4
20	25	5
20	26	2
20	27	1
20	28	4
20	30	10
20	32	4
20	35	5
20	36	4
20	38	2
20	39	1
20	40	20
20	42	2
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

FAQ

What is the Greatest Common Divisor of 20 and 39?

GCF (HCF) of 20 and 39 is 1

How to find the GCF of 20 and 39?

You can find the GCF of 20 and 39 by listing all factors of both numbers and picking the greatest common one, or by prime factorization. The GCF of 20 and 39 is 1.

What prime factors do 20 and 39 share?

20 and 39 have no prime factor in common, so the only integer that divides both of them is 1 and their GCF is 1.

How does the GCF reduce the fraction 20/39?

Divide the numerator and the denominator by the GCF 1: 20 ÷ 1 = 20 and 39 ÷ 1 = 39. So 20/39 in lowest terms is 20/39.

Are 20 and 39 coprime?

Yes, 20 and 39 are coprime (relatively prime) because their Greatest Common Factor is 1.