820790 has 16 divisors (see below), whose sum is σ = 1488240. Its totient is φ = 325920.

The previous prime is 820789. The next prime is 820793. The reversal of 820790 is 97028.

820790 = 193² + 194² + ... + 212².

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (820793) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1916 + ... + 2304.

It is an arithmetic number, because the mean of its divisors is an integer number (93015).

2⁸²⁰⁷⁹⁰ is an apocalyptic number.

820790 is a deficient number, since it is larger than the sum of its proper divisors (667450).

820790 is a wasteful number, since it uses less digits than its factorization.

820790 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 607.

The product of its (nonzero) digits is 1008, while the sum is 26.

The square root of 820790 is about 905.9746133309. The cubic root of 820790 is about 93.6290648044.

The spelling of 820790 in words is "eight hundred twenty thousand, seven hundred ninety".