What is the Least Common Multiple of 21280 and 21290?

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 21280 and 21290 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 21280 and 21290, than apply into the LCM equation.

GCF(21280,21290) = 10
LCM(21280,21290) = ( 21280 × 21290) / 10
LCM(21280,21290) = 453051200 / 10
LCM(21280,21290) = 45305120

Least Common Multiple (LCM) of 21280 and 21290 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 21280 and 21290. First we will calculate the prime factors of 21280 and 21290.

Prime Factorization of 21280

Prime Factorization of 21290

Now multiplying the highest exponent prime factors to calculate the LCM of 21280 and 21290.

LCM(21280,21290) = 2⁵ × 5¹ × 7¹ × 19¹ × 2129¹
LCM(21280,21290) = 45305120