What is the Least Common Multiple of 21438 and 21452?

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 21438 and 21452 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 21438 and 21452, than apply into the LCM equation.

GCF(21438,21452) = 2
LCM(21438,21452) = ( 21438 × 21452) / 2
LCM(21438,21452) = 459887976 / 2
LCM(21438,21452) = 229943988

Least Common Multiple (LCM) of 21438 and 21452 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 21438 and 21452. First we will calculate the prime factors of 21438 and 21452.

Prime Factorization of 21438

Prime Factorization of 21452

Now multiplying the highest exponent prime factors to calculate the LCM of 21438 and 21452.

LCM(21438,21452) = 2² × 3³ × 397¹ × 31¹ × 173¹
LCM(21438,21452) = 229943988