What is the Least Common Multiple of 19917 and 19921?

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 19917 and 19921 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 19917 and 19921, than apply into the LCM equation.

GCF(19917,19921) = 1
LCM(19917,19921) = ( 19917 × 19921) / 1
LCM(19917,19921) = 396766557 / 1
LCM(19917,19921) = 396766557

Least Common Multiple (LCM) of 19917 and 19921 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 19917 and 19921. First we will calculate the prime factors of 19917 and 19921.

Prime Factorization of 19917

Prime Factorization of 19921

Now multiplying the highest exponent prime factors to calculate the LCM of 19917 and 19921.

LCM(19917,19921) = 3² × 2213¹ × 11¹ × 1811¹
LCM(19917,19921) = 396766557