20320004566 has 4 divisors (see below), whose sum is σ = 30480006852. Its totient is φ = 10160002282.

The previous prime is 20320004539. The next prime is 20320004567. The reversal of 20320004566 is 66540002302.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20320004567) 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 as a sum of consecutive naturals, namely, 5080001140 + ... + 5080001143.

It is an arithmetic number, because the mean of its divisors is an integer number (7620001713).

Almost surely, 2^20320004566 is an apocalyptic number.

20320004566 is a deficient number, since it is larger than the sum of its proper divisors (10160002286).

20320004566 is a wasteful number, since it uses less digits than its factorization.

20320004566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10160002285.

The product of its (nonzero) digits is 8640, while the sum is 28.

Adding to 20320004566 its reverse (66540002302), we get a palindrome (86860006868).

The spelling of 20320004566 in words is "twenty billion, three hundred twenty million, four thousand, five hundred sixty-six".