18716420 has 24 divisors (see below), whose sum is σ = 40048344. Its totient is φ = 7344896.

The previous prime is 18716407. The next prime is 18716431. The reversal of 18716420 is 2461781.

It can be written as a sum of positive squares in 4 ways, for example, as 891136 + 17825284 = 944^2 + 4222^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7769 + ... + 9888.

It is an arithmetic number, because the mean of its divisors is an integer number (1668681).

Almost surely, 2^18716420 is an apocalyptic number.

18716420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18716420 is an abundant number, since it is smaller than the sum of its proper divisors (21331924).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18716420 is a wasteful number, since it uses less digits than its factorization.

18716420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17719 (or 17717 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 29.

The square root of 18716420 is about 4326.2477968790. The cubic root of 18716420 is about 265.5059516353.

The spelling of 18716420 in words is "eighteen million, seven hundred sixteen thousand, four hundred twenty".