GCF (HCF) of 20 and 47

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What is the Greatest Common Divisor of 20 and 47?

Answer

GCF (HCF) of 20 and 47 is
1

Common factors: 1

Only 1 divides both: 20 and 47 share no prime factor.

Such numbers are called coprime (relatively prime); their LCM is just the product: 20 × 47 = 940.

20 = 22 × 5

47 — prime

Prime2047Lowest power
222——
55——
47—47—

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

GCF = 1

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GCF Table

Number 1Number 2GCF
20244
20255
20262
20271
20284
203010
20324
20355
20364
20382
20391
204020
20422
20444
20455
20471
20484
205010
20555
20564
20582
20591
206020
207010
20755
20844
209010
2010020
201555
201655

FAQ

What is the Greatest Common Divisor of 20 and 47?

GCF (HCF) of 20 and 47 is 1

How to find the GCF of 20 and 47?

You can find the GCF of 20 and 47 by listing all factors of both numbers and picking the greatest common one, or by prime factorization. The GCF of 20 and 47 is 1.

What prime factors do 20 and 47 share?

20 and 47 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 20/47?

Divide the numerator and the denominator by the GCF 1: 20 ÷ 1 = 20 and 47 ÷ 1 = 47. So 20/47 in lowest terms is 20/47.

Are 20 and 47 coprime?

Yes, 20 and 47 are coprime (relatively prime) because their Greatest Common Factor is 1.

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