What is the Least Common Multiple of 21440 and 21448?

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 21440 and 21448 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 21440 and 21448, than apply into the LCM equation.

GCF(21440,21448) = 8
LCM(21440,21448) = ( 21440 × 21448) / 8
LCM(21440,21448) = 459845120 / 8
LCM(21440,21448) = 57480640

Least Common Multiple (LCM) of 21440 and 21448 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 21440 and 21448. First we will calculate the prime factors of 21440 and 21448.

Prime Factorization of 21440

Prime Factorization of 21448

Now multiplying the highest exponent prime factors to calculate the LCM of 21440 and 21448.

LCM(21440,21448) = 2⁶ × 5¹ × 67¹ × 7¹ × 383¹
LCM(21440,21448) = 57480640