What is the Least Common Multiple of 21605 and 21618?

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 21605 and 21618 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 21605 and 21618, than apply into the LCM equation.

GCF(21605,21618) = 1
LCM(21605,21618) = ( 21605 × 21618) / 1
LCM(21605,21618) = 467056890 / 1
LCM(21605,21618) = 467056890

Least Common Multiple (LCM) of 21605 and 21618 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 21605 and 21618. First we will calculate the prime factors of 21605 and 21618.

Prime Factorization of 21605

Prime Factorization of 21618

Now multiplying the highest exponent prime factors to calculate the LCM of 21605 and 21618.

LCM(21605,21618) = 5¹ × 29¹ × 149¹ × 2¹ × 3² × 1201¹
LCM(21605,21618) = 467056890