820466 has 4 divisors (see below), whose sum is σ = 1230702. Its totient is φ = 410232.

The previous prime is 820459. The next prime is 820481. The reversal of 820466 is 664028.

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

It can be written as a sum of positive squares in only one way, i.e., 687241 + 133225 = 829^2 + 365^2 .

It is an unprimeable number.

820466 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 205115 + ... + 205118.

2⁸²⁰⁴⁶⁶ is an apocalyptic number.

820466 is a deficient number, since it is larger than the sum of its proper divisors (410236).

820466 is a wasteful number, since it uses less digits than its factorization.

820466 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 410235.

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 820466 is about 905.7957827237. The cubic root of 820466 is about 93.6167434191.

The spelling of 820466 in words is "eight hundred twenty thousand, four hundred sixty-six".