20400311105 has 4 divisors (see below), whose sum is σ = 24480373332. Its totient is φ = 16320248880.

The previous prime is 20400311093. The next prime is 20400311111. The reversal of 20400311105 is 50111300402.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4148905744 + 16251405361 = 64412^2 + 127481^2 .

It is not a de Polignac number, because 20400311105 - 2²⁰ = 20399262529 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2040031106 + ... + 2040031115.

It is an arithmetic number, because the mean of its divisors is an integer number (6120093333).

Almost surely, 2^20400311105 is an apocalyptic number.

It is an amenable number.

20400311105 is a deficient number, since it is larger than the sum of its proper divisors (4080062227).

20400311105 is an equidigital number, since it uses as much as digits as its factorization.

20400311105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4080062226.

The product of its (nonzero) digits is 120, while the sum is 17.

Adding to 20400311105 its reverse (50111300402), we get a palindrome (70511611507).

The spelling of 20400311105 in words is "twenty billion, four hundred million, three hundred eleven thousand, one hundred five".