20731296 has 48 divisors (see below), whose sum is σ = 57625344. Its totient is φ = 6503424.

The previous prime is 20731283. The next prime is 20731301. The reversal of 20731296 is 69213702.

It is a tau number, because it is divible by the number of its divisors (48).

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 7 ways as a sum of consecutive naturals, for example, 4720 + ... + 7983.

It is an arithmetic number, because the mean of its divisors is an integer number (1200528).

Almost surely, 2^20731296 is an apocalyptic number.

It is an amenable number.

20731296 is an abundant number, since it is smaller than the sum of its proper divisors (36894048).

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

20731296 is a wasteful number, since it uses less digits than its factorization.

20731296 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12733 (or 12725 counting only the distinct ones).

The product of its (nonzero) digits is 4536, while the sum is 30.

The square root of 20731296 is about 4553.1632959954. The cubic root of 20731296 is about 274.7106421980.

Adding to 20731296 its reverse (69213702), we get a palindrome (89944998).

The spelling of 20731296 in words is "twenty million, seven hundred thirty-one thousand, two hundred ninety-six".