What is the Least Common Multiple of 20981 and 20989?

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 20981 and 20989 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 20981 and 20989, than apply into the LCM equation.

GCF(20981,20989) = 1
LCM(20981,20989) = ( 20981 × 20989) / 1
LCM(20981,20989) = 440370209 / 1
LCM(20981,20989) = 440370209

Least Common Multiple (LCM) of 20981 and 20989 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 20981 and 20989. First we will calculate the prime factors of 20981 and 20989.

Prime Factorization of 20981

Prime Factorization of 20989

Now multiplying the highest exponent prime factors to calculate the LCM of 20981 and 20989.

LCM(20981,20989) = 20981¹ × 139¹ × 151¹
LCM(20981,20989) = 440370209