320805 has 12 divisors (see below), whose sum is σ = 556140. Its totient is φ = 171072.

The previous prime is 320791. The next prime is 320821. The reversal of 320805 is 508023.

Added to its reverse (508023) it gives a triangular number (828828 = T₁₂₈₇).

It can be written as a sum of positive squares in 2 ways, for example, as 159201 + 161604 = 399^2 + 402^2 .

It is not a de Polignac number, because 320805 - 2⁶ = 320741 is a prime.

It is a plaindrome in base 12.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3520 + ... + 3609.

It is an arithmetic number, because the mean of its divisors is an integer number (46345).

2³²⁰⁸⁰⁵ is an apocalyptic number.

It is an amenable number.

320805 is a deficient number, since it is larger than the sum of its proper divisors (235335).

320805 is a wasteful number, since it uses less digits than its factorization.

320805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7140 (or 7137 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 320805 is about 566.3965042265. The cubic root of 320805 is about 68.4563452825.

Adding to 320805 its reverse (508023), we get a palindrome (828828).

The spelling of 320805 in words is "three hundred twenty thousand, eight hundred five".