20515312304 has 20 divisors (see below), whose sum is σ = 40141969440. Its totient is φ = 10156094400.

The previous prime is 20515312291. The next prime is 20515312351. The reversal of 20515312304 is 40321351502.

It is a happy number.

It is a super-3 number, since 3×20515312304³ (a number of 32 digits) contains 333 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6345944 + ... + 6349175.

It is an arithmetic number, because the mean of its divisors is an integer number (2007098472).

Almost surely, 2^20515312304 is an apocalyptic number.

It is an amenable number.

20515312304 is a deficient number, since it is larger than the sum of its proper divisors (19626657136).

20515312304 is a wasteful number, since it uses less digits than its factorization.

20515312304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12695228 (or 12695222 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 26.

Adding to 20515312304 its reverse (40321351502), we get a palindrome (60836663806).

The spelling of 20515312304 in words is "twenty billion, five hundred fifteen million, three hundred twelve thousand, three hundred four".