320555 has 8 divisors (see below), whose sum is σ = 391344. Its totient is φ = 252000.

The previous prime is 320539. The next prime is 320561. The reversal of 320555 is 555023.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 320555 - 2⁴ = 320539 is a prime.

It is a Duffinian number.

320555 is a modest number, since divided by 555 gives 320 as remainder.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 221 + ... + 830.

It is an arithmetic number, because the mean of its divisors is an integer number (48918).

2³²⁰⁵⁵⁵ is an apocalyptic number.

320555 is a deficient number, since it is larger than the sum of its proper divisors (70789).

320555 is a wasteful number, since it uses less digits than its factorization.

320555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1117.

The product of its (nonzero) digits is 750, while the sum is 20.

The square root of 320555 is about 566.1757677612. The cubic root of 320555 is about 68.4385582219.

Adding to 320555 its reverse (555023), we get a palindrome (875578).

The spelling of 320555 in words is "three hundred twenty thousand, five hundred fifty-five".