20744859 has 8 divisors (see below), whose sum is σ = 28552192. Its totient is φ = 13383720.

The previous prime is 20744809. The next prime is 20744863. The reversal of 20744859 is 95844702.

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

It is not a de Polignac number, because 20744859 - 2¹¹ = 20742811 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20744809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 111439 + ... + 111624.

It is an arithmetic number, because the mean of its divisors is an integer number (3569024).

Almost surely, 2^20744859 is an apocalyptic number.

20744859 is a deficient number, since it is larger than the sum of its proper divisors (7807333).

20744859 is a wasteful number, since it uses less digits than its factorization.

20744859 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223097.

The product of its (nonzero) digits is 80640, while the sum is 39.

The square root of 20744859 is about 4554.6524565547. The cubic root of 20744859 is about 274.7705369614.

The spelling of 20744859 in words is "twenty million, seven hundred forty-four thousand, eight hundred fifty-nine".