LCM for 19 and 20

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What's the Least Common Multiple (LCM) of 19 and 20?

Answer

LCM of 19 and 20 is
380

First common multiples: 380; 760; 1,140; …

380 is divisible by both: 380 ÷ 19 = 20, 380 ÷ 20 = 19 — and 20 and 19 share no factor but 1, so no smaller number is. As a common denominator: multiply the top and bottom of x/19 by 20 and of y/20 by 19.

19 and 20 are coprime (GCF = 1), so their LCM is simply the product: 19 × 20 = 380.

19 — prime

20 = 22 × 5

Prime1920Highest power
2—2222
5—55
1919—19

— = power 0: the prime is not a factor of this number; the LCM takes it from the number that has it.

LCM = 22 × 5 × 19 = 380

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LCM Table

Number 1Number 2LCM
1920380
1922418
1923437
1924456
1926494
1928532
1929551
1933627
1934646
1935665
193838
1939741
1940760
1941779
1942798
1943817
1945855
1946874
1947893
1948912
1949931
1950950
1952988
19551,045
195757
19591,121
19601,140

FAQ

What's the Least Common Multiple (LCM) of 19 and 20?

LCM of 19 and 20 is 380

How to find the LCM of 19 and 20 using prime factorization?

To find the LCM of 19 and 20, find all prime factors of both numbers, then multiply the highest power of each prime factor. The result is 380.

What is the difference between LCM and GCF?

LCM (Least Common Multiple) is the smallest number divisible by both numbers, while GCF (Greatest Common Factor) is the largest number that divides both. For 19 and 20: LCM = 380, GCF = 1.

See Also