20880239 has 4 divisors (see below), whose sum is σ = 21222600. Its totient is φ = 20537880.

The previous prime is 20880191. The next prime is 20880257. The reversal of 20880239 is 93208802.

It is a happy number.

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 20880239 - 2²⁰ = 19831663 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 (20880269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 171089 + ... + 171210.

It is an arithmetic number, because the mean of its divisors is an integer number (5305650).

Almost surely, 2^20880239 is an apocalyptic number.

20880239 is a deficient number, since it is larger than the sum of its proper divisors (342361).

20880239 is an equidigital number, since it uses as much as digits as its factorization.

20880239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 342360.

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 20880239 is about 4569.4900153081. The cubic root of 20880239 is about 275.3669547529.

The spelling of 20880239 in words is "twenty million, eight hundred eighty thousand, two hundred thirty-nine".