820103 has 4 divisors (see below), whose sum is σ = 837600. Its totient is φ = 802608.

The previous prime is 820093. The next prime is 820109. The reversal of 820103 is 301028.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-820103 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (820109) 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, 8678 + ... + 8771.

It is an arithmetic number, because the mean of its divisors is an integer number (209400).

2⁸²⁰¹⁰³ is an apocalyptic number.

820103 is a deficient number, since it is larger than the sum of its proper divisors (17497).

820103 is a wasteful number, since it uses less digits than its factorization.

820103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17496.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 820103 is about 905.5953842639. The cubic root of 820103 is about 93.6029350505.

The spelling of 820103 in words is "eight hundred twenty thousand, one hundred three".