18020431618 has 16 divisors (see below), whose sum is σ = 30894822720. Its totient is φ = 7722378576.

The previous prime is 18020431609. The next prime is 18020431619. The reversal of 18020431618 is 81613402081.

It is not an unprimeable number, because it can be changed into a prime (18020431619) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 136380 + ... + 233752.

It is an arithmetic number, because the mean of its divisors is an integer number (1930926420).

Almost surely, 2^18020431618 is an apocalyptic number.

18020431618 is a deficient number, since it is larger than the sum of its proper divisors (12874391102).

18020431618 is a wasteful number, since it uses less digits than its factorization.

18020431618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110601.

The product of its (nonzero) digits is 9216, while the sum is 34.

Adding to 18020431618 its reverse (81613402081), we get a palindrome (99633833699).

The spelling of 18020431618 in words is "eighteen billion, twenty million, four hundred thirty-one thousand, six hundred eighteen".