20313618 has 48 divisors (see below), whose sum is σ = 45376128. Its totient is φ = 6026400.

The previous prime is 20313611. The next prime is 20313619. The reversal of 20313618 is 81631302.

It is not an unprimeable number, because it can be changed into a prime (20313611) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 74823 + ... + 75093.

It is an arithmetic number, because the mean of its divisors is an integer number (945336).

Almost surely, 2^20313618 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20313618, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22688064).

20313618 is an abundant number, since it is smaller than the sum of its proper divisors (25062510).

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

20313618 is a wasteful number, since it uses less digits than its factorization.

20313618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 351 (or 320 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 20313618 is about 4507.0631235872. The cubic root of 20313618 is about 272.8532265288.

The spelling of 20313618 in words is "twenty million, three hundred thirteen thousand, six hundred eighteen".