20704439 has 8 divisors (see below), whose sum is σ = 24691200. Its totient is φ = 16974936.

The previous prime is 20704417. The next prime is 20704447. The reversal of 20704439 is 93440702.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20704439 - 2⁸ = 20704183 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 (20704459) 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 7 ways as a sum of consecutive naturals, for example, 64139 + ... + 64460.

It is an arithmetic number, because the mean of its divisors is an integer number (3086400).

Almost surely, 2^20704439 is an apocalyptic number.

20704439 is a deficient number, since it is larger than the sum of its proper divisors (3986761).

20704439 is a wasteful number, since it uses less digits than its factorization.

20704439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128629.

The product of its (nonzero) digits is 6048, while the sum is 29.

The square root of 20704439 is about 4550.2130719341. The cubic root of 20704439 is about 274.5919634624.

The spelling of 20704439 in words is "twenty million, seven hundred four thousand, four hundred thirty-nine".