18687056 has 20 divisors (see below), whose sum is σ = 36342912. Its totient is φ = 9308256.

The previous prime is 18687041. The next prime is 18687061. The reversal of 18687056 is 65078681.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2465 + ... + 6591.

Almost surely, 2^18687056 is an apocalyptic number.

18687056 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

18687056 is a deficient number, since it is larger than the sum of its proper divisors (17655856).

18687056 is a wasteful number, since it uses less digits than its factorization.

18687056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4418 (or 4412 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 41.

The square root of 18687056 is about 4322.8527617766. The cubic root of 18687056 is about 265.3670291008.

The spelling of 18687056 in words is "eighteen million, six hundred eighty-seven thousand, fifty-six".