20321345504 has 48 divisors (see below), whose sum is σ = 40629414672. Its totient is φ = 10003611648.

The previous prime is 20321345477. The next prime is 20321345509. The reversal of 20321345504 is 40554312302.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20321345509) 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, 765152 + ... + 791264.

It is an arithmetic number, because the mean of its divisors is an integer number (846446139).

Almost surely, 2^20321345504 is an apocalyptic number.

It is an amenable number.

20321345504 is a deficient number, since it is larger than the sum of its proper divisors (20308069168).

20321345504 is a wasteful number, since it uses less digits than its factorization.

20321345504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26499 (or 26491 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 29.

Adding to 20321345504 its reverse (40554312302), we get a palindrome (60875657806).

The spelling of 20321345504 in words is "twenty billion, three hundred twenty-one million, three hundred forty-five thousand, five hundred four".