What is the Least Common Multiple of 21657 and 21665?

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 21657 and 21665 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 21657 and 21665, than apply into the LCM equation.

GCF(21657,21665) = 1
LCM(21657,21665) = ( 21657 × 21665) / 1
LCM(21657,21665) = 469198905 / 1
LCM(21657,21665) = 469198905

Least Common Multiple (LCM) of 21657 and 21665 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 21657 and 21665. First we will calculate the prime factors of 21657 and 21665.

Prime Factorization of 21657

Prime Factorization of 21665

Now multiplying the highest exponent prime factors to calculate the LCM of 21657 and 21665.

LCM(21657,21665) = 3¹ × 7219¹ × 5¹ × 7¹ × 619¹
LCM(21657,21665) = 469198905