20504439 has 18 divisors (see below), whose sum is σ = 31263336. Its totient is φ = 12948120.

The previous prime is 20504437. The next prime is 20504453. The reversal of 20504439 is 93440502.

It is not a de Polignac number, because 20504439 - 2¹ = 20504437 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20504437) 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 17 ways as a sum of consecutive naturals, for example, 94 + ... + 6404.

It is an arithmetic number, because the mean of its divisors is an integer number (1736852).

Almost surely, 2^20504439 is an apocalyptic number.

20504439 is a deficient number, since it is larger than the sum of its proper divisors (10758897).

20504439 is a wasteful number, since it uses less digits than its factorization.

20504439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6355 (or 6333 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 20504439 is about 4528.1827480790. The cubic root of 20504439 is about 273.7049365993.

The spelling of 20504439 in words is "twenty million, five hundred four thousand, four hundred thirty-nine".