20309344 has 24 divisors (see below), whose sum is σ = 43619688. Its totient is φ = 9231360.

The previous prime is 20309327. The next prime is 20309369. The reversal of 20309344 is 44390302.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28497 + ... + 29200.

It is an arithmetic number, because the mean of its divisors is an integer number (1817487).

Almost surely, 2^20309344 is an apocalyptic number.

It is an amenable number.

20309344 is an abundant number, since it is smaller than the sum of its proper divisors (23310344).

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

20309344 is a wasteful number, since it uses less digits than its factorization.

20309344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57718 (or 57710 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 25.

The square root of 20309344 is about 4506.5889539651. The cubic root of 20309344 is about 272.8340890141.

Adding to 20309344 its reverse (44390302), we get a palindrome (64699646).

The spelling of 20309344 in words is "twenty million, three hundred nine thousand, three hundred forty-four".