20130111 has 12 divisors (see below), whose sum is σ = 29130192. Its totient is φ = 13395456.

The previous prime is 20130079. The next prime is 20130163. The reversal of 20130111 is 11103102.

It is not a de Polignac number, because 20130111 - 2⁵ = 20130079 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 20130093 and 20130102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20134111) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4095 + ... + 7551.

It is an arithmetic number, because the mean of its divisors is an integer number (2427516).

Almost surely, 2^20130111 is an apocalyptic number.

20130111 is a deficient number, since it is larger than the sum of its proper divisors (9000081).

20130111 is a wasteful number, since it uses less digits than its factorization.

20130111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4110 (or 4107 counting only the distinct ones).

The product of its (nonzero) digits is 6, while the sum is 9.

The square root of 20130111 is about 4486.6592248576. The cubic root of 20130111 is about 272.0291157918.

Adding to 20130111 its reverse (11103102), we get a palindrome (31233213).

The spelling of 20130111 in words is "twenty million, one hundred thirty thousand, one hundred eleven".