What is the Least Common Multiple of 21980 and 21998?

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 21980 and 21998 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 21980 and 21998, than apply into the LCM equation.

GCF(21980,21998) = 2
LCM(21980,21998) = ( 21980 × 21998) / 2
LCM(21980,21998) = 483516040 / 2
LCM(21980,21998) = 241758020

Least Common Multiple (LCM) of 21980 and 21998 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 21980 and 21998. First we will calculate the prime factors of 21980 and 21998.

Prime Factorization of 21980

Prime Factorization of 21998

Now multiplying the highest exponent prime factors to calculate the LCM of 21980 and 21998.

LCM(21980,21998) = 2² × 5¹ × 7¹ × 157¹ × 17¹ × 647¹
LCM(21980,21998) = 241758020