820803 has 4 divisors (see below), whose sum is σ = 1094408. Its totient is φ = 547200.

The previous prime is 820793. The next prime is 820837. The reversal of 820803 is 308028.

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

It is not a de Polignac number, because 820803 - 2¹⁶ = 755267 is a prime.

It is a D-number.

It is a Duffinian number.

It is a nialpdrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 820803.

It is not an unprimeable number, because it can be changed into a prime (820873) 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, 136798 + ... + 136803.

It is an arithmetic number, because the mean of its divisors is an integer number (273602).

2⁸²⁰⁸⁰³ is an apocalyptic number.

820803 is a deficient number, since it is larger than the sum of its proper divisors (273605).

820803 is a wasteful number, since it uses less digits than its factorization.

820803 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 273604.

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 820803 is about 905.9817878964. The cubic root of 820803 is about 93.6295591133.

The spelling of 820803 in words is "eight hundred twenty thousand, eight hundred three".