20044439 has 4 divisors (see below), whose sum is σ = 20099424. Its totient is φ = 19989456.

The previous prime is 20044397. The next prime is 20044447. The reversal of 20044439 is 93444002.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20044439 - 2²⁰ = 18995863 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 (20044459) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26942 + ... + 27675.

It is an arithmetic number, because the mean of its divisors is an integer number (5024856).

Almost surely, 2^20044439 is an apocalyptic number.

20044439 is a deficient number, since it is larger than the sum of its proper divisors (54985).

20044439 is an equidigital number, since it uses as much as digits as its factorization.

20044439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54984.

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 20044439 is about 4477.1016294027. The cubic root of 20044439 is about 271.6426562810.

The spelling of 20044439 in words is "twenty million, forty-four thousand, four hundred thirty-nine".