What is the Least Common Multiple of 19997 and 20003?

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 19997 and 20003 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 19997 and 20003, than apply into the LCM equation.

GCF(19997,20003) = 1
LCM(19997,20003) = ( 19997 × 20003) / 1
LCM(19997,20003) = 399999991 / 1
LCM(19997,20003) = 399999991

Least Common Multiple (LCM) of 19997 and 20003 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 19997 and 20003. First we will calculate the prime factors of 19997 and 20003.

Prime Factorization of 19997

Prime Factorization of 20003

Now multiplying the highest exponent prime factors to calculate the LCM of 19997 and 20003.

LCM(19997,20003) = 19997¹ × 83¹ × 241¹
LCM(19997,20003) = 399999991