820304 has 20 divisors (see below), whose sum is σ = 1604064. Its totient is φ = 406368.

The previous prime is 820279. The next prime is 820319. The reversal of 820304 is 403028.

It is an Ulam number.

It is a congruent 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, 2519 + ... + 2825.

2⁸²⁰³⁰⁴ is an apocalyptic number.

It is an amenable number.

820304 is a deficient number, since it is larger than the sum of its proper divisors (783760).

820304 is a wasteful number, since it uses less digits than its factorization.

820304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 482 (or 476 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 820304 is about 905.7063541789. The cubic root of 820304 is about 93.6105815100.

The spelling of 820304 in words is "eight hundred twenty thousand, three hundred four".