What is the Least Common Multiple of 19781 and 19787?

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 19781 and 19787 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 19781 and 19787, than apply into the LCM equation.

GCF(19781,19787) = 1
LCM(19781,19787) = ( 19781 × 19787) / 1
LCM(19781,19787) = 391406647 / 1
LCM(19781,19787) = 391406647

Least Common Multiple (LCM) of 19781 and 19787 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 19781 and 19787. First we will calculate the prime factors of 19781 and 19787.

Prime Factorization of 19781

Prime Factorization of 19787

Now multiplying the highest exponent prime factors to calculate the LCM of 19781 and 19787.

LCM(19781,19787) = 131¹ × 151¹ × 47¹ × 421¹
LCM(19781,19787) = 391406647