20311211313 has 12 divisors (see below), whose sum is σ = 30350086260. Its totient is φ = 13073882976.

The previous prime is 20311211311. The next prime is 20311211387. The reversal of 20311211313 is 31311211302.

20311211313 is a `hidden beast` number, since 20 + 311 + 21 + 1 + 313 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 13125597489 + 7185613824 = 114567^2 + 84768^2 .

It is not a de Polignac number, because 20311211313 - 2¹ = 20311211311 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20311211311) 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, 38910106 + ... + 38910627.

It is an arithmetic number, because the mean of its divisors is an integer number (2529173855).

Almost surely, 2^20311211313 is an apocalyptic number.

It is an amenable number.

20311211313 is a deficient number, since it is larger than the sum of its proper divisors (10038874947).

20311211313 is a wasteful number, since it uses less digits than its factorization.

20311211313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77820768 (or 77820765 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

Adding to 20311211313 its reverse (31311211302), we get a palindrome (51622422615).

The spelling of 20311211313 in words is "twenty billion, three hundred eleven million, two hundred eleven thousand, three hundred thirteen".