What is the Least Common Multiple of 21960 and 21975?

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 21960 and 21975 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 21960 and 21975, than apply into the LCM equation.

GCF(21960,21975) = 15
LCM(21960,21975) = ( 21960 × 21975) / 15
LCM(21960,21975) = 482571000 / 15
LCM(21960,21975) = 32171400

Least Common Multiple (LCM) of 21960 and 21975 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 21960 and 21975. First we will calculate the prime factors of 21960 and 21975.

Prime Factorization of 21960

Prime Factorization of 21975

Now multiplying the highest exponent prime factors to calculate the LCM of 21960 and 21975.

LCM(21960,21975) = 2³ × 3² × 5² × 61¹ × 293¹
LCM(21960,21975) = 32171400