18720116 has 12 divisors (see below), whose sum is σ = 32797632. Its totient is φ = 9349368.

The previous prime is 18720083. The next prime is 18720173. The reversal of 18720116 is 61102781.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 2291 + ... + 6533.

It is an arithmetic number, because the mean of its divisors is an integer number (2733136).

Almost surely, 2^18720116 is an apocalyptic number.

It is an amenable number.

18720116 is a deficient number, since it is larger than the sum of its proper divisors (14077516).

18720116 is a wasteful number, since it uses less digits than its factorization.

18720116 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5350 (or 5348 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 26.

The square root of 18720116 is about 4326.6749357908. The cubic root of 18720116 is about 265.5234272959.

Adding to 18720116 its reverse (61102781), we get a palindrome (79822897).

The spelling of 18720116 in words is "eighteen million, seven hundred twenty thousand, one hundred sixteen".