GCF and LCM of 2 and 20
The greatest common factor and least common multiple of 2 and 20.
GCF of 2 and 20
2
LCM of 2 and 20
20
How it works
Break each number into its prime factors:
- 2 = 2
- 20 = 2² × 5
The GCF (2) multiplies the primes both share, at the lowest power each appears. The LCM (20) multiplies every prime that appears in either number, at the highest power — which is also 2 × 20 ÷ 2 = 20.
Try other numbers
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Frequently asked questions
What is the GCF of 2 and 20?+
The greatest common factor (GCF) of 2 and 20 is 2 — the largest number that divides both 2 and 20 with no remainder.
What is the LCM of 2 and 20?+
The least common multiple (LCM) of 2 and 20 is 20 — the smallest number that both 2 and 20 divide into. It equals 2 × 20 ÷ GCF = 40 ÷ 2 = 20.