What is the Least Common Multiple of 21465 and 21480?

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 21465 and 21480 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 21465 and 21480, than apply into the LCM equation.

GCF(21465,21480) = 15
LCM(21465,21480) = ( 21465 × 21480) / 15
LCM(21465,21480) = 461068200 / 15
LCM(21465,21480) = 30737880

Least Common Multiple (LCM) of 21465 and 21480 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 21465 and 21480. First we will calculate the prime factors of 21465 and 21480.

Prime Factorization of 21465

Prime Factorization of 21480

Now multiplying the highest exponent prime factors to calculate the LCM of 21465 and 21480.

LCM(21465,21480) = 3⁴ × 5¹ × 53¹ × 2³ × 179¹
LCM(21465,21480) = 30737880