20321311311 has 72 divisors (see below), whose sum is σ = 34829181504. Its totient is φ = 11381005440.

The previous prime is 20321311289. The next prime is 20321311337. The reversal of 20321311311 is 11311312302.

20321311311 is a `hidden beast` number, since 2 + 0 + 321 + 31 + 1 + 311 = 666.

It is not a de Polignac number, because 20321311311 - 2⁹ = 20321310799 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20321311111) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 8526426 + ... + 8528808.

It is an arithmetic number, because the mean of its divisors is an integer number (483738632).

Almost surely, 2^20321311311 is an apocalyptic number.

20321311311 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

20321311311 is a deficient number, since it is larger than the sum of its proper divisors (14507870193).

20321311311 is a wasteful number, since it uses less digits than its factorization.

20321311311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2781 (or 2771 counting only the distinct ones).

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

Adding to 20321311311 its reverse (11311312302), we get a palindrome (31632623613).

Subtracting from 20321311311 its reverse (11311312302), we obtain a palindrome (9009999009).

The spelling of 20321311311 in words is "twenty billion, three hundred twenty-one million, three hundred eleven thousand, three hundred eleven".