Feedback form

GCF (HCF) of 20 and 40

"Greatest Common Factor" Calculator

What is the Greatest Common Divisor of 20 and 40?

Answer

GCF (HCF) of 20 and 40 is

20

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

20 divides 40 (40 ÷ 20 = 2), so the GCF is the smaller number itself.

20 = 2² × 5

40 = 2³ × 5

Prime	20	40	Lowest power
2	2²	2³	2²
5	5	5	5

GCF = 2² × 5 = 20

More with these numbers

Found an error in the calculation or the information?

Related Calculations

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

Share This Calculation

Print

https://calculat.io/en/number/greatest-common-factor-of/20--40

<a href="https://calculat.io/en/number/greatest-common-factor-of/20--40">What is the GCF (HCF) of 20 and 40 - Calculatio</a>

Facebook

Twitter

Telegram

WhatsApp

Viber

Email

What is the GCF (HCF) of 20 and 40. The GCF of 20 and 40 is 20 — the biggest number that can divide both integers. Step-by-step GCF (GCD) calculation by factoring.

https://calculat.io/en/number/greatest-common-factor-of/20--40/generated.jpg

GCF Table

Number 1	Number 2	GCF
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
20	84	4

FAQ

What is the Greatest Common Divisor of 20 and 40?

GCF (HCF) of 20 and 40 is 20

How to find the GCF of 20 and 40?

You can find the GCF of 20 and 40 by listing all factors of both numbers and picking the greatest common one, or by prime factorization. The GCF of 20 and 40 is 20.

What prime factors do 20 and 40 share?

The prime factorizations of 20 and 40 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 20/40?

Divide the numerator and the denominator by the GCF 20: 20 ÷ 20 = 1 and 40 ÷ 20 = 2. So 20/40 in lowest terms is 1/2.