20311308 has 36 divisors (see below), whose sum is σ = 52540488. Its totient is φ = 6612480.

The previous prime is 20311307. The next prime is 20311321. The reversal of 20311308 is 80311302.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (20311307) 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 11 ways as a sum of consecutive naturals, for example, 5013 + ... + 8108.

It is an arithmetic number, because the mean of its divisors is an integer number (1459458).

Almost surely, 2^20311308 is an apocalyptic number.

It is an amenable number.

20311308 is an abundant number, since it is smaller than the sum of its proper divisors (32229180).

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

20311308 is a wasteful number, since it uses less digits than its factorization.

20311308 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13174 (or 13169 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 20311308 is about 4506.8068518631. The cubic root of 20311308 is about 272.8428834698.

It can be divided in two parts, 203 and 11308, that added together give a palindrome (11511).

The spelling of 20311308 in words is "twenty million, three hundred eleven thousand, three hundred eight".