820104 has 16 divisors (see below), whose sum is σ = 2050320. Its totient is φ = 273360.

The previous prime is 820093. The next prime is 820109. The reversal of 820104 is 401028.

It is not an unprimeable number, because it can be changed into a prime (820109) by changing a digit.

820104 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17062 + ... + 17109.

It is an arithmetic number, because the mean of its divisors is an integer number (128145).

2⁸²⁰¹⁰⁴ is an apocalyptic number.

It is an amenable number.

820104 is an abundant number, since it is smaller than the sum of its proper divisors (1230216).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

820104 is a wasteful number, since it uses less digits than its factorization.

820104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34180 (or 34176 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 820104 is about 905.5959363866. The cubic root of 820104 is about 93.6029730957.

The spelling of 820104 in words is "eight hundred twenty thousand, one hundred four".