320505 has 16 divisors (see below), whose sum is σ = 535680. Its totient is φ = 163328.

The previous prime is 320483. The next prime is 320513. The reversal of 320505 is 505023.

It is a cyclic number.

It is not a de Polignac number, because 320505 - 2⁷ = 320377 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an Ulam number.

It is a plaindrome in base 12.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 320505.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 120 + ... + 809.

It is an arithmetic number, because the mean of its divisors is an integer number (33480).

2³²⁰⁵⁰⁵ is an apocalyptic number.

It is an amenable number.

320505 is a deficient number, since it is larger than the sum of its proper divisors (215175).

320505 is a wasteful number, since it uses less digits than its factorization.

320505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 960.

The product of its (nonzero) digits is 150, while the sum is 15.

The square root of 320505 is about 566.1316101403. The cubic root of 320505 is about 68.4349997002.

Adding to 320505 its reverse (505023), we get a palindrome (825528).

The spelling of 320505 in words is "three hundred twenty thousand, five hundred five".