20340439 has 6 divisors (see below), whose sum is σ = 23661384. Its totient is φ = 17434620.

The previous prime is 20340413. The next prime is 20340443. The reversal of 20340439 is 93404302.

It is not a de Polignac number, because 20340439 - 2⁵ = 20340407 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 (20340409) 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, 207507 + ... + 207604.

It is an arithmetic number, because the mean of its divisors is an integer number (3943564).

Almost surely, 2^20340439 is an apocalyptic number.

20340439 is a deficient number, since it is larger than the sum of its proper divisors (3320945).

20340439 is an equidigital number, since it uses as much as digits as its factorization.

20340439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 415125 (or 415118 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 25.

The square root of 20340439 is about 4510.0375829920. The cubic root of 20340439 is about 272.9732605851.

The spelling of 20340439 in words is "twenty million, three hundred forty thousand, four hundred thirty-nine".