18505668 has 24 divisors (see below), whose sum is σ = 43826272. Its totient is φ = 6076224.

The previous prime is 18505657. The next prime is 18505679. The reversal of 18505668 is 86650581.

It is an interprime number because it is at equal distance from previous prime (18505657) and next prime (18505679).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10705 + ... + 12312.

Almost surely, 2^18505668 is an apocalyptic number.

It is an amenable number.

18505668 is an abundant number, since it is smaller than the sum of its proper divisors (25320604).

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

18505668 is a wasteful number, since it uses less digits than its factorization.

18505668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23091 (or 23089 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 39.

The square root of 18505668 is about 4301.8214746779. The cubic root of 18505668 is about 264.5056310540.

The spelling of 18505668 in words is "eighteen million, five hundred five thousand, six hundred sixty-eight".