What is the Least Common Multiple of 21858 and 21870?

Least common multiple or lowest common denominator (lcd) can be calculated in two way; with the LCM formula calculation of greatest common factor (GCF), or multiplying the prime factors with the highest exponent factor.

Least Common Multiple of 21858 and 21870 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 21858 and 21870, than apply into the LCM equation.

GCF(21858,21870) = 6
LCM(21858,21870) = ( 21858 × 21870) / 6
LCM(21858,21870) = 478034460 / 6
LCM(21858,21870) = 79672410

Least Common Multiple (LCM) of 21858 and 21870 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 21858 and 21870. First we will calculate the prime factors of 21858 and 21870.

Prime Factorization of 21858

Prime Factorization of 21870

Now multiplying the highest exponent prime factors to calculate the LCM of 21858 and 21870.

LCM(21858,21870) = 2¹ × 3⁷ × 3643¹ × 5¹
LCM(21858,21870) = 79672410