20431504110321 has 24 divisors (see below), whose sum is σ = 29852740053864. Its totient is φ = 13464159851520.

The previous prime is 20431504110319. The next prime is 20431504110359. The reversal of 20431504110321 is 12301140513402.

20431504110321 is a `hidden beast` number, since 2 + 0 + 4 + 31 + 504 + 1 + 103 + 21 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 222307535025 + 20209196575296 = 471495^2 + 4495464^2 .

It is not a de Polignac number, because 20431504110321 - 2¹ = 20431504110319 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20431504110821) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13536486 + ... + 14969951.

It is an arithmetic number, because the mean of its divisors is an integer number (1243864168911).

Almost surely, 2^{20431504110321} is an apocalyptic number.

It is an amenable number.

20431504110321 is a deficient number, since it is larger than the sum of its proper divisors (9421235943543).

20431504110321 is a wasteful number, since it uses less digits than its factorization.

20431504110321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28507361 (or 28507358 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

Adding to 20431504110321 its reverse (12301140513402), we get a palindrome (32732644623723).

The spelling of 20431504110321 in words is "twenty trillion, four hundred thirty-one billion, five hundred four million, one hundred ten thousand, three hundred twenty-one".