13020239 has 4 divisors (see below), whose sum is σ = 13036920. Its totient is φ = 13003560.

The previous prime is 13020233. The next prime is 13020251. The reversal of 13020239 is 93202031.

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 13020239 - 2⁴ = 13020223 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 13020239.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13020233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7109 + ... + 8750.

It is an arithmetic number, because the mean of its divisors is an integer number (3259230).

Almost surely, 2^13020239 is an apocalyptic number.

13020239 is a deficient number, since it is larger than the sum of its proper divisors (16681).

13020239 is an equidigital number, since it uses as much as digits as its factorization.

13020239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16680.

The product of its (nonzero) digits is 324, while the sum is 20.

The square root of 13020239 is about 3608.3568282530. The cubic root of 13020239 is about 235.2554277157.

The spelling of 13020239 in words is "thirteen million, twenty thousand, two hundred thirty-nine".