20239644 has 12 divisors (see below), whose sum is σ = 47225864. Its totient is φ = 6746544.

The previous prime is 20239643. The next prime is 20239649. The reversal of 20239644 is 44693202.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20239643) 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, 843307 + ... + 843330.

Almost surely, 2^20239644 is an apocalyptic number.

It is an amenable number.

20239644 is an abundant number, since it is smaller than the sum of its proper divisors (26986220).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20239644 is a wasteful number, since it uses less digits than its factorization.

20239644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1686644 (or 1686642 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 30.

The square root of 20239644 is about 4498.8491861808. The cubic root of 20239644 is about 272.5216165552.

The spelling of 20239644 in words is "twenty million, two hundred thirty-nine thousand, six hundred forty-four".