20309296 has 40 divisors (see below), whose sum is σ = 45309600. Its totient is φ = 8638464.

The previous prime is 20309281. The next prime is 20309297. The reversal of 20309296 is 69290302.

It is not an unprimeable number, because it can be changed into a prime (20309297) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16080 + ... + 17296.

It is an arithmetic number, because the mean of its divisors is an integer number (1132740).

Almost surely, 2^20309296 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20309296, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22654800).

20309296 is an abundant number, since it is smaller than the sum of its proper divisors (25000304).

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

20309296 is a wasteful number, since it uses less digits than its factorization.

20309296 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1381 (or 1375 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 31.

The square root of 20309296 is about 4506.5836284263. The cubic root of 20309296 is about 272.8338740712.

Adding to 20309296 its reverse (69290302), we get a palindrome (89599598).

The spelling of 20309296 in words is "twenty million, three hundred nine thousand, two hundred ninety-six".