203720113 has 4 divisors (see below), whose sum is σ = 209226100. Its totient is φ = 198214128.

The previous prime is 203720059. The next prime is 203720123. The reversal of 203720113 is 311027302.

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

It can be written as a sum of positive squares in 2 ways, for example, as 74511424 + 129208689 = 8632^2 + 11367^2 .

It is a cyclic number.

It is not a de Polignac number, because 203720113 - 2⁹ = 203719601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (203720123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2752938 + ... + 2753011.

It is an arithmetic number, because the mean of its divisors is an integer number (52306525).

Almost surely, 2^203720113 is an apocalyptic number.

It is an amenable number.

203720113 is a deficient number, since it is larger than the sum of its proper divisors (5505987).

203720113 is an equidigital number, since it uses as much as digits as its factorization.

203720113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5505986.

The product of its (nonzero) digits is 252, while the sum is 19.

The square root of 203720113 is about 14273.0554892777. The cubic root of 203720113 is about 588.4071880328.

Adding to 203720113 its reverse (311027302), we get a palindrome (514747415).

The spelling of 203720113 in words is "two hundred three million, seven hundred twenty thousand, one hundred thirteen".