820495 has 12 divisors (see below), whose sum is σ = 1067256. Its totient is φ = 605280.

The previous prime is 820489. The next prime is 820537. The reversal of 820495 is 594028.

It is a happy number.

It is not a de Polignac number, because 820495 - 2⁷ = 820367 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 360 + ... + 1330.

It is an arithmetic number, because the mean of its divisors is an integer number (88938).

2⁸²⁰⁴⁹⁵ is an apocalyptic number.

820495 is a deficient number, since it is larger than the sum of its proper divisors (246761).

820495 is a wasteful number, since it uses less digits than its factorization.

820495 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1002 (or 989 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 820495 is about 905.8117906055. The cubic root of 820495 is about 93.6178463913.

It can be divided in two parts, 8 and 20495, that added together give a triangular number (20503 = T₂₀₂).

The spelling of 820495 in words is "eight hundred twenty thousand, four hundred ninety-five".