GCF and LCM of 4
Every pair this site works through that contains 4. 24 of them share a factor with it; 9 share nothing, which is its own kind of answer.
Shares a factor with 4
Shares nothing with 4
What 4 is made of
Every common factor 4 can share with anything comes from this list, which is why the pairs below look the way they do. 4 = 2², and that factorisation is unique — the fundamental theorem of arithmetic guarantees no other set of primes multiplies to it.
- Divisors (3)
- 1, 2, 4
- As factor pairs
- 1×4, 2×2
- Prime factorisation
- 2²
- Divisors excluding itself add to
- 3 — deficient
4 is a perfect square, so it has an odd number of divisors — the square root pairs with itself. The greatest common factor of 4 and any other number is the largest entry two lists like this one share.