20431296 has 84 divisors (see below), whose sum is σ = 59436000. Its totient is φ = 6709248.

The previous prime is 20431277. The next prime is 20431303. The reversal of 20431296 is 69213402.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 45280 + ... + 45728.

Almost surely, 2^20431296 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 20431296, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29718000).

20431296 is an abundant number, since it is smaller than the sum of its proper divisors (39004704).

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

20431296 is a wasteful number, since it uses less digits than its factorization.

20431296 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 546 (or 533 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 20431296 is about 4520.0991139576. The cubic root of 20431296 is about 273.3790973674.

Adding to 20431296 its reverse (69213402), we get a palindrome (89644698).

The spelling of 20431296 in words is "twenty million, four hundred thirty-one thousand, two hundred ninety-six".