What is the Least Common Multiple of 21781 and 21791?

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 21791 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 21791, than apply into the LCM equation.

GCF(21781,21791) = 1
LCM(21781,21791) = ( 21781 × 21791) / 1
LCM(21781,21791) = 474629771 / 1
LCM(21781,21791) = 474629771

Least Common Multiple (LCM) of 21781 and 21791 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 21781 and 21791. First we will calculate the prime factors of 21781 and 21791.

Prime Factorization of 21781

Prime Factorization of 21791

Now multiplying the highest exponent prime factors to calculate the LCM of 21781 and 21791.

LCM(21781,21791) = 23¹ × 947¹ × 7¹ × 11¹ × 283¹
LCM(21781,21791) = 474629771