20311636799 has 4 divisors (see below), whose sum is σ = 20312121720. Its totient is φ = 20311151880.

The previous prime is 20311636757. The next prime is 20311636819. The reversal of 20311636799 is 99763611302.

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 20311636799 - 2¹² = 20311632703 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 (20311636199) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 172997 + ... + 265614.

It is an arithmetic number, because the mean of its divisors is an integer number (5078030430).

Almost surely, 2^20311636799 is an apocalyptic number.

20311636799 is a deficient number, since it is larger than the sum of its proper divisors (484921).

20311636799 is an equidigital number, since it uses as much as digits as its factorization.

20311636799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 484920.

The product of its (nonzero) digits is 367416, while the sum is 47.

The spelling of 20311636799 in words is "twenty billion, three hundred eleven million, six hundred thirty-six thousand, seven hundred ninety-nine".