20311113 has 16 divisors (see below), whose sum is σ = 28498176. Its totient is φ = 12850560.

The previous prime is 20311111. The next prime is 20311129. The reversal of 20311113 is 31111302.

It is not a de Polignac number, because 20311113 - 2¹ = 20311111 is a prime.

It is a super-2 number, since 2×20311113² = 825082622597538, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20311111) 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 15 ways as a sum of consecutive naturals, for example, 2320 + ... + 6782.

It is an arithmetic number, because the mean of its divisors is an integer number (1781136).

Almost surely, 2^20311113 is an apocalyptic number.

It is an amenable number.

20311113 is a deficient number, since it is larger than the sum of its proper divisors (8187063).

20311113 is a wasteful number, since it uses less digits than its factorization.

20311113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4544.

The product of its (nonzero) digits is 18, while the sum is 12.

The square root of 20311113 is about 4506.7852178687. The cubic root of 20311113 is about 272.8420103186.

Adding to 20311113 its reverse (31111302), we get a palindrome (51422415).

The spelling of 20311113 in words is "twenty million, three hundred eleven thousand, one hundred thirteen".