820538 has 8 divisors (see below), whose sum is σ = 1245888. Its totient is φ = 405244.

The previous prime is 820537. The next prime is 820541. The reversal of 820538 is 835028.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (820537) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2306 + ... + 2637.

It is an arithmetic number, because the mean of its divisors is an integer number (155736).

2⁸²⁰⁵³⁸ is an apocalyptic number.

820538 is a deficient number, since it is larger than the sum of its proper divisors (425350).

820538 is a wasteful number, since it uses less digits than its factorization.

820538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5028.

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 820538 is about 905.8355259096. The cubic root of 820538 is about 93.6194817850.

The spelling of 820538 in words is "eight hundred twenty thousand, five hundred thirty-eight".