What is the Least Common Multiple of 21987 and 21994?

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 21987 and 21994 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 21987 and 21994, than apply into the LCM equation.

GCF(21987,21994) = 7
LCM(21987,21994) = ( 21987 × 21994) / 7
LCM(21987,21994) = 483582078 / 7
LCM(21987,21994) = 69083154

Least Common Multiple (LCM) of 21987 and 21994 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 21987 and 21994. First we will calculate the prime factors of 21987 and 21994.

Prime Factorization of 21987

Prime Factorization of 21994

Now multiplying the highest exponent prime factors to calculate the LCM of 21987 and 21994.

LCM(21987,21994) = 3² × 7¹ × 349¹ × 2¹ × 1571¹
LCM(21987,21994) = 69083154