203320013 has 6 divisors (see below), whose sum is σ = 220163274. Its totient is φ = 187679856.

The previous prime is 203320001. The next prime is 203320021. The reversal of 203320013 is 310023302.

It can be written as a sum of positive squares in 3 ways, for example, as 20448484 + 182871529 = 4522^2 + 13523^2 .

It is not a de Polignac number, because 203320013 - 2⁴ = 203319997 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 203320013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (203320093) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 601370 + ... + 601707.

It is an arithmetic number, because the mean of its divisors is an integer number (36693879).

Almost surely, 2^203320013 is an apocalyptic number.

It is an amenable number.

203320013 is a deficient number, since it is larger than the sum of its proper divisors (16843261).

203320013 is a wasteful number, since it uses less digits than its factorization.

203320013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1203103 (or 1203090 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 14.

The square root of 203320013 is about 14259.0326810762. The cubic root of 203320013 is about 588.0217310756.

Adding to 203320013 its reverse (310023302), we get a palindrome (513343315).

The spelling of 203320013 in words is "two hundred three million, three hundred twenty thousand, thirteen".