20312011 has 4 divisors (see below), whose sum is σ = 20325352. Its totient is φ = 20298672.

The previous prime is 20311981. The next prime is 20312021. The reversal of 20312011 is 11021302.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11021302 = 2 ⋅5510651.

It is a cyclic number.

It is not a de Polignac number, because 20312011 - 2⁵ = 20311979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20312021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4041 + ... + 7546.

It is an arithmetic number, because the mean of its divisors is an integer number (5081338).

Almost surely, 2^20312011 is an apocalyptic number.

20312011 is a deficient number, since it is larger than the sum of its proper divisors (13341).

20312011 is a wasteful number, since it uses less digits than its factorization.

20312011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13340.

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 20312011 is about 4506.8848443243. The cubic root of 20312011 is about 272.8460312457.

Adding to 20312011 its reverse (11021302), we get a palindrome (31333313).

The spelling of 20312011 in words is "twenty million, three hundred twelve thousand, eleven".