18820016 has 20 divisors (see below), whose sum is σ = 36807912. Its totient is φ = 9321216.

The previous prime is 18819991. The next prime is 18820031. The reversal of 18820016 is 61002881.

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, 3785 + ... + 7208.

Almost surely, 2^18820016 is an apocalyptic number.

18820016 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

18820016 is a deficient number, since it is larger than the sum of its proper divisors (17987896).

18820016 is a wasteful number, since it uses less digits than its factorization.

18820016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11108 (or 11102 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 26.

The square root of 18820016 is about 4338.2042367782. The cubic root of 18820016 is about 265.9949119949.

Adding to 18820016 its reverse (61002881), we get a palindrome (79822897).

The spelling of 18820016 in words is "eighteen million, eight hundred twenty thousand, sixteen".