320142305 has 16 divisors (see below), whose sum is σ = 462161280. Its totient is φ = 207971712.

The previous prime is 320142299. The next prime is 320142379. The reversal of 320142305 is 503241023.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 320142305 - 2¹⁶ = 320076769 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 240044 + ... + 241373.

It is an arithmetic number, because the mean of its divisors is an integer number (28885080).

Almost surely, 2^320142305 is an apocalyptic number.

320142305 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

320142305 is a deficient number, since it is larger than the sum of its proper divisors (142018975).

320142305 is a wasteful number, since it uses less digits than its factorization.

320142305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 481448.

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 320142305 is about 17892.5209235591. The cubic root of 320142305 is about 684.0917545311.

Adding to 320142305 its reverse (503241023), we get a palindrome (823383328).

The spelling of 320142305 in words is "three hundred twenty million, one hundred forty-two thousand, three hundred five".