320420521304 has 24 divisors (see below), whose sum is σ = 650557939860. Its totient is φ = 147886393824.

The previous prime is 320420521283. The next prime is 320420521313. The reversal of 320420521304 is 403125024023.

It is a Harshad number since it is a multiple of its sum of digits (26).

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 5 ways as a sum of consecutive naturals, for example, 118497362 + ... + 118500065.

Almost surely, 2^320420521304 is an apocalyptic number.

It is an amenable number.

320420521304 is an abundant number, since it is smaller than the sum of its proper divisors (330137418556).

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

320420521304 is a wasteful number, since it uses less digits than its factorization.

320420521304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 236997459 (or 236997442 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 26.

Adding to 320420521304 its reverse (403125024023), we get a palindrome (723545545327).

The spelling of 320420521304 in words is "three hundred twenty billion, four hundred twenty million, five hundred twenty-one thousand, three hundred four".