GCF and LCM of 80
Every pair this site works through that contains 80. 29 of them share a factor with it; 0 share nothing, which is its own kind of answer.
Shares a factor with 80
with 2: 2with 4: 4with 5: 5with 6: 2with 8: 8with 10: 10with 12: 4with 14: 2with 15: 5with 16: 16with 18: 2with 20: 20with 24: 8with 25: 5with 30: 10with 32: 16with 36: 4with 40: 40with 45: 5with 48: 16with 50: 10with 60: 20with 64: 16with 72: 8with 75: 5with 90: 10with 96: 16with 100: 20with 120: 40
What 80 is made of
Every common factor 80 can share with anything comes from this list, which is why the pairs below look the way they do. 80 = 2⁴ × 5, and that factorisation is unique — the fundamental theorem of arithmetic guarantees no other set of primes multiplies to it.
- Divisors (10)
- 1, 2, 4, 5, 8, 10, 16, 20, 40, 80
- As factor pairs
- 1×80, 2×40, 4×20, 5×16, 8×10
- Prime factorisation
- 2⁴ × 5
- Divisors excluding itself add to
- 106 — abundant
Divisors come in pairs that multiply to 80, which is why there is an even number of them unless the number is a perfect square. The greatest common factor of 80 and any other number is the largest entry two lists like this one share.