20313111331 has 4 divisors (see below), whose sum is σ = 20315670232. Its totient is φ = 20310552432.

The previous prime is 20313111307. The next prime is 20313111341. The reversal of 20313111331 is 13311131302.

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

It is a cyclic number.

It is not a de Polignac number, because 20313111331 - 2⁹ = 20313110819 is a prime.

It is a super-2 number, since 2×20313111331² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20313111299 and 20313111308.

It is not an unprimeable number, because it can be changed into a prime (20313111341) 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, 1267506 + ... + 1283431.

It is an arithmetic number, because the mean of its divisors is an integer number (5078917558).

Almost surely, 2^20313111331 is an apocalyptic number.

20313111331 is a deficient number, since it is larger than the sum of its proper divisors (2558901).

20313111331 is an equidigital number, since it uses as much as digits as its factorization.

20313111331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2558900.

The product of its (nonzero) digits is 162, while the sum is 19.

Adding to 20313111331 its reverse (13311131302), we get a palindrome (33624242633).

The spelling of 20313111331 in words is "twenty billion, three hundred thirteen million, one hundred eleven thousand, three hundred thirty-one".