What is the Least Common Multiple of 19987 and 19992?

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 19987 and 19992 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 19987 and 19992, than apply into the LCM equation.

GCF(19987,19992) = 1
LCM(19987,19992) = ( 19987 × 19992) / 1
LCM(19987,19992) = 399580104 / 1
LCM(19987,19992) = 399580104

Least Common Multiple (LCM) of 19987 and 19992 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 19987 and 19992. First we will calculate the prime factors of 19987 and 19992.

Prime Factorization of 19987

Prime Factorization of 19992

Now multiplying the highest exponent prime factors to calculate the LCM of 19987 and 19992.

LCM(19987,19992) = 11¹ × 23¹ × 79¹ × 2³ × 3¹ × 7² × 17¹
LCM(19987,19992) = 399580104