820903 has 4 divisors (see below), whose sum is σ = 849240. Its totient is φ = 792568.

The previous prime is 820901. The next prime is 820907. The reversal of 820903 is 309028.

820903 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 820903 - 2¹ = 820901 is a prime.

It is an Ulam number.

It is a Duffinian number.

820903 is a lucky number.

It is a plaindrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (820901) 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, 14125 + ... + 14182.

It is an arithmetic number, because the mean of its divisors is an integer number (212310).

2⁸²⁰⁹⁰³ is an apocalyptic number.

820903 is a deficient number, since it is larger than the sum of its proper divisors (28337).

820903 is a wasteful number, since it uses less digits than its factorization.

820903 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28336.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 820903 is about 906.0369749629. The cubic root of 820903 is about 93.6333613150.

The spelling of 820903 in words is "eight hundred twenty thousand, nine hundred three".