320906305 has 4 divisors (see below), whose sum is σ = 385087572. Its totient is φ = 256725040.

The previous prime is 320906293. The next prime is 320906323. The reversal of 320906305 is 503609023.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 43983424 + 276922881 = 6632^2 + 16641^2 .

It is not a de Polignac number, because 320906305 - 2¹³ = 320898113 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32090626 + ... + 32090635.

It is an arithmetic number, because the mean of its divisors is an integer number (96271893).

Almost surely, 2^320906305 is an apocalyptic number.

It is an amenable number.

320906305 is a deficient number, since it is larger than the sum of its proper divisors (64181267).

320906305 is an equidigital number, since it uses as much as digits as its factorization.

320906305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64181266.

The product of its (nonzero) digits is 4860, while the sum is 28.

The square root of 320906305 is about 17913.8579038687. The cubic root of 320906305 is about 684.6355032415.

The spelling of 320906305 in words is "three hundred twenty million, nine hundred six thousand, three hundred five".