20311201013 has 4 divisors (see below), whose sum is σ = 20327946828. Its totient is φ = 20294455200.

The previous prime is 20311200997. The next prime is 20311201033. The reversal of 20311201013 is 31010211302.

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 4243610449 + 16067590564 = 65143^2 + 126758^2 .

It is a cyclic number.

It is not a de Polignac number, because 20311201013 - 2⁴ = 20311200997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20311201033) 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, 8371088 + ... + 8373513.

It is an arithmetic number, because the mean of its divisors is an integer number (5081986707).

Almost surely, 2^20311201013 is an apocalyptic number.

It is an amenable number.

20311201013 is a deficient number, since it is larger than the sum of its proper divisors (16745815).

20311201013 is a wasteful number, since it uses less digits than its factorization.

20311201013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16745814.

The product of its (nonzero) digits is 36, while the sum is 14.

Adding to 20311201013 its reverse (31010211302), we get a palindrome (51321412315).

The spelling of 20311201013 in words is "twenty billion, three hundred eleven million, two hundred one thousand, thirteen".