20434239 has 24 divisors (see below), whose sum is σ = 34824192. Its totient is φ = 11298960.

The previous prime is 20434231. The next prime is 20434247. The reversal of 20434239 is 93243402.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20434231) and next prime (20434247).

It is not a de Polignac number, because 20434239 - 2³ = 20434231 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20434231) 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 23 ways as a sum of consecutive naturals, for example, 3279 + ... + 7184.

It is an arithmetic number, because the mean of its divisors is an integer number (1451008).

Almost surely, 2^20434239 is an apocalyptic number.

20434239 is a deficient number, since it is larger than the sum of its proper divisors (14389953).

20434239 is a wasteful number, since it uses less digits than its factorization.

20434239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10507 (or 10504 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 27.

The square root of 20434239 is about 4520.4246481940. The cubic root of 20434239 is about 273.3922229185.

It can be divided in two parts, 204 and 34239, that added together give a palindrome (34443).

The spelling of 20434239 in words is "twenty million, four hundred thirty-four thousand, two hundred thirty-nine".