820320395 has 4 divisors (see below), whose sum is σ = 984384480. Its totient is φ = 656256312.

The previous prime is 820320353. The next prime is 820320401. The reversal of 820320395 is 593023028.

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

It is a cyclic number.

It is not a de Polignac number, because 820320395 - 2¹⁰ = 820319371 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 82032035 + ... + 82032044.

It is an arithmetic number, because the mean of its divisors is an integer number (246096120).

Almost surely, 2^820320395 is an apocalyptic number.

820320395 is a deficient number, since it is larger than the sum of its proper divisors (164064085).

820320395 is a wasteful number, since it uses less digits than its factorization.

820320395 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164064084.

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 820320395 is about 28641.2359195619. The cubic root of 820320395 is about 936.1120515494.

The spelling of 820320395 in words is "eight hundred twenty million, three hundred twenty thousand, three hundred ninety-five".