820684 has 6 divisors (see below), whose sum is σ = 1436204. Its totient is φ = 410340.

The previous prime is 820681. The next prime is 820691. The reversal of 820684 is 486028.

It is a nialpdrome in base 7.

It is a zygodrome in base 7.

It is not an unprimeable number, because it can be changed into a prime (820681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102582 + ... + 102589.

2⁸²⁰⁶⁸⁴ is an apocalyptic number.

It is an amenable number.

820684 is a deficient number, since it is larger than the sum of its proper divisors (615520).

820684 is a wasteful number, since it uses less digits than its factorization.

820684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205175 (or 205173 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 28.

The square root of 820684 is about 905.9161109065. The cubic root of 820684 is about 93.6250340908.

The spelling of 820684 in words is "eight hundred twenty thousand, six hundred eighty-four".