20318618 has 16 divisors (see below), whose sum is σ = 32266080. Its totient is φ = 9579696.

The previous prime is 20318593. The next prime is 20318651. The reversal of 20318618 is 81681302.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Curzon 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, 1580 + ... + 6567.

It is an arithmetic number, because the mean of its divisors is an integer number (2016630).

Almost surely, 2^20318618 is an apocalyptic number.

20318618 is a deficient number, since it is larger than the sum of its proper divisors (11947462).

20318618 is a wasteful number, since it uses less digits than its factorization.

20318618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8221.

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 20318618 is about 4507.6177743904. The cubic root of 20318618 is about 272.8756114172.

The spelling of 20318618 in words is "twenty million, three hundred eighteen thousand, six hundred eighteen".