20311131131009 has 4 divisors (see below), whose sum is σ = 20311140565716. Its totient is φ = 20311121696304.

The previous prime is 20311131130993. The next prime is 20311131131059. The reversal of 20311131131009 is 90013113111302.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 9728959480384 + 10582171650625 = 3119128^2 + 3253025^2 .

It is a cyclic number.

It is not a de Polignac number, because 20311131131009 - 2⁴ = 20311131130993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20311131131059) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 268187 + ... + 6379199.

It is an arithmetic number, because the mean of its divisors is an integer number (5077785141429).

Almost surely, 2^{20311131131009} is an apocalyptic number.

It is an amenable number.

20311131131009 is a deficient number, since it is larger than the sum of its proper divisors (9434707).

20311131131009 is an equidigital number, since it uses as much as digits as its factorization.

20311131131009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9434706.

The product of its (nonzero) digits is 486, while the sum is 26.

The spelling of 20311131131009 in words is "twenty trillion, three hundred eleven billion, one hundred thirty-one million, one hundred thirty-one thousand, nine".