20312011111 has 12 divisors (see below), whose sum is σ = 25018156368. Its totient is φ = 16386159552.

The previous prime is 20312011079. The next prime is 20312011141. The reversal of 20312011111 is 11111021302.

It is a happy number.

It is not a de Polignac number, because 20312011111 - 2⁵ = 20312011079 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20312011091 and 20312011100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20312011141) 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, 12191251 + ... + 12192916.

It is an arithmetic number, because the mean of its divisors is an integer number (2084846364).

Almost surely, 2^20312011111 is an apocalyptic number.

20312011111 is a deficient number, since it is larger than the sum of its proper divisors (4706145257).

20312011111 is a wasteful number, since it uses less digits than its factorization.

20312011111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24384198 (or 24384191 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 13.

Adding to 20312011111 its reverse (11111021302), we get a palindrome (31423032413).

The spelling of 20312011111 in words is "twenty billion, three hundred twelve million, eleven thousand, one hundred eleven".