20816400704 has 28 divisors (see below), whose sum is σ = 45062778048. Its totient is φ = 9462000000.

The previous prime is 20816400653. The next prime is 20816400713. The reversal of 20816400704 is 40700461802.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14783672 + ... + 14785079.

Almost surely, 2^20816400704 is an apocalyptic number.

It is an amenable number.

20816400704 is an abundant number, since it is smaller than the sum of its proper divisors (24246377344).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20816400704 is a wasteful number, since it uses less digits than its factorization.

20816400704 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29568774 (or 29568764 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 32.

The spelling of 20816400704 in words is "twenty billion, eight hundred sixteen million, four hundred thousand, seven hundred four".