20684400311 has 8 divisors (see below), whose sum is σ = 20824380720. Its totient is φ = 20544691648.

The previous prime is 20684400283. The next prime is 20684400337. The reversal of 20684400311 is 11300448602.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20684400311 - 2³⁴ = 3504531127 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 (20684402311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 85985 + ... + 220821.

It is an arithmetic number, because the mean of its divisors is an integer number (2603047590).

Almost surely, 2^20684400311 is an apocalyptic number.

20684400311 is a deficient number, since it is larger than the sum of its proper divisors (139980409).

20684400311 is a wasteful number, since it uses less digits than its factorization.

20684400311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135873.

The product of its (nonzero) digits is 4608, while the sum is 29.

Adding to 20684400311 its reverse (11300448602), we get a palindrome (31984848913).

The spelling of 20684400311 in words is "twenty billion, six hundred eighty-four million, four hundred thousand, three hundred eleven".