20499618 has 32 divisors (see below), whose sum is σ = 42577920. Its totient is φ = 6572880.

The previous prime is 20499571. The next prime is 20499659. The reversal of 20499618 is 81699402.

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 15 ways as a sum of consecutive naturals, for example, 56923 + ... + 57281.

It is an arithmetic number, because the mean of its divisors is an integer number (1330560).

Almost surely, 2^20499618 is an apocalyptic number.

20499618 is an abundant number, since it is smaller than the sum of its proper divisors (22078302).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20499618 is a wasteful number, since it uses less digits than its factorization.

20499618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 702.

The product of its (nonzero) digits is 31104, while the sum is 39.

The square root of 20499618 is about 4527.6503840292. The cubic root of 20499618 is about 273.6834837661.

The spelling of 20499618 in words is "twenty million, four hundred ninety-nine thousand, six hundred eighteen".