20320567644 has 24 divisors (see below), whose sum is σ = 51061939600. Its totient is φ = 6252482304.

The previous prime is 20320567627. The next prime is 20320567669. The reversal of 20320567644 is 44676502302.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 65129869 + ... + 65130180.

Almost surely, 2^20320567644 is an apocalyptic number.

It is an amenable number.

20320567644 is an abundant number, since it is smaller than the sum of its proper divisors (30741371956).

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

20320567644 is a wasteful number, since it uses less digits than its factorization.

20320567644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130260069 (or 130260067 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 39.

The spelling of 20320567644 in words is "twenty billion, three hundred twenty million, five hundred sixty-seven thousand, six hundred forty-four".