GCF (HCF) of 1 and 20

"Greatest Common Factor" Calculator

What is the Greatest Common Divisor of 1 and 20?

Answer

GCF (HCF) of 1 and 20 is

Common factors: 1

1 divides every number: the GCF with 1 is always 1, and the LCM is the other number itself — here 20.

1 — no prime factors

20 = 2² × 5

Prime	1	20	Lowest power
2	—	2²	—
5	—	5	—

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

GCF = 1

More with these numbers

Found an error in the calculation or the information?

Related Calculations

GCF Table

Number 1	Number 2	GCF
1	1	1
1	4	1
1	5	1
1	6	1
1	7	1
1	8	1
1	9	1
1	10	1
1	12	1
1	13	1
1	16	1
1	20	1
1	27	1
1	56	1
1	100	1

FAQ

What is the Greatest Common Divisor of 1 and 20?

GCF (HCF) of 1 and 20 is 1

How to find the GCF of 1 and 20?

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

What prime factors do 1 and 20 share?

1 and 20 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 1/20?

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

Are 1 and 20 coprime?

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

GCF (HCF) of 1 and 20

What is the Greatest Common Divisor of 1 and 20?

More with these numbers

Related Calculations

See Also

GCF Table

FAQ

What is the Greatest Common Divisor of 1 and 20?

How to find the GCF of 1 and 20?

What prime factors do 1 and 20 share?

How does the GCF reduce the fraction 1/20?

Are 1 and 20 coprime?

See Also