What is the Least Common Multiple of 21781 and 21787?

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 21781 and 21787 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 21781 and 21787, than apply into the LCM equation.

GCF(21781,21787) = 1
LCM(21781,21787) = ( 21781 × 21787) / 1
LCM(21781,21787) = 474542647 / 1
LCM(21781,21787) = 474542647

Least Common Multiple (LCM) of 21781 and 21787 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 21781 and 21787. First we will calculate the prime factors of 21781 and 21787.

Prime Factorization of 21781

Prime Factorization of 21787

Now multiplying the highest exponent prime factors to calculate the LCM of 21781 and 21787.

LCM(21781,21787) = 23¹ × 947¹ × 21787¹
LCM(21781,21787) = 474542647