320560 has 20 divisors (see below), whose sum is σ = 745488. Its totient is φ = 128192.

The previous prime is 320539. The next prime is 320561. The reversal of 320560 is 65023.

It is a tau number, because it is divible by the number of its divisors (20).

It is a Harshad number since it is a multiple of its sum of digits (16).

It is not an unprimeable number, because it can be changed into a prime (320561) by changing a digit.

320560 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1924 + ... + 2083.

2³²⁰⁵⁶⁰ is an apocalyptic number.

It is an amenable number.

320560 is an abundant number, since it is smaller than the sum of its proper divisors (424928).

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

320560 is a wasteful number, since it uses less digits than its factorization.

320560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4020 (or 4014 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 16.

The square root of 320560 is about 566.1801833339. The cubic root of 320560 is about 68.4389140538.

Adding to 320560 its reverse (65023), we get a palindrome (385583).

The spelling of 320560 in words is "three hundred twenty thousand, five hundred sixty".