320305 has 12 divisors (see below), whose sum is σ = 406260. Its totient is φ = 242144.

The previous prime is 320303. The next prime is 320317. The reversal of 320305 is 503023.

It can be written as a sum of positive squares in 2 ways, for example, as 141376 + 178929 = 376^2 + 423^2 .

It is not a de Polignac number, because 320305 - 2¹ = 320303 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (320303) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6792 + ... + 6838.

It is an arithmetic number, because the mean of its divisors is an integer number (33855).

2³²⁰³⁰⁵ is an apocalyptic number.

It is an amenable number.

320305 is a deficient number, since it is larger than the sum of its proper divisors (85955).

320305 is an equidigital number, since it uses as much as digits as its factorization.

320305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128 (or 81 counting only the distinct ones).

The product of its (nonzero) digits is 90, while the sum is 13.

The square root of 320305 is about 565.9549452032. The cubic root of 320305 is about 68.4207619109.

Adding to 320305 its reverse (503023), we get a palindrome (823328).

It can be divided in two parts, 320 and 305, that added together give a 4-th power (625 = 5⁴).

The spelling of 320305 in words is "three hundred twenty thousand, three hundred five".