320605 has 8 divisors (see below), whose sum is σ = 395352. Its totient is φ = 249408.

The previous prime is 320591. The next prime is 320609. The reversal of 320605 is 506023.

It can be written as a sum of positive squares in 4 ways, for example, as 79524 + 241081 = 282^2 + 491^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 320605 - 2⁷ = 320477 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (320609) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 682 + ... + 1051.

It is an arithmetic number, because the mean of its divisors is an integer number (49419).

2³²⁰⁶⁰⁵ is an apocalyptic number.

It is an amenable number.

320605 is a deficient number, since it is larger than the sum of its proper divisors (74747).

320605 is a wasteful number, since it uses less digits than its factorization.

320605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1775.

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

The square root of 320605 is about 566.2199219385. The cubic root of 320605 is about 68.4421163737.

Adding to 320605 its reverse (506023), we get a palindrome (826628).

It can be divided in two parts, 320 and 605, that multiplied together give a square (193600 = 440²).

The spelling of 320605 in words is "three hundred twenty thousand, six hundred five".