20664038599 has 4 divisors (see below), whose sum is σ = 20669998840. Its totient is φ = 20658078360.

The previous prime is 20664038531. The next prime is 20664038623. The reversal of 20664038599 is 99583046602.

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 20664038599 - 2²⁵ = 20630484167 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 (20664038099) 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 3 ways as a sum of consecutive naturals, for example, 2974917 + ... + 2981854.

It is an arithmetic number, because the mean of its divisors is an integer number (5167499710).

Almost surely, 2^20664038599 is an apocalyptic number.

20664038599 is a deficient number, since it is larger than the sum of its proper divisors (5960241).

20664038599 is an equidigital number, since it uses as much as digits as its factorization.

20664038599 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5960240.

The product of its (nonzero) digits is 2799360, while the sum is 52.

The spelling of 20664038599 in words is "twenty billion, six hundred sixty-four million, thirty-eight thousand, five hundred ninety-nine".