20431321110 has 48 divisors (see below), whose sum is σ = 55917304560. Its totient is φ = 5161596480.

The previous prime is 20431321109. The next prime is 20431321133. The reversal of 20431321110 is 1112313402.

20431321110 is a `hidden beast` number, since 20 + 431 + 3 + 211 + 1 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5972361 + ... + 5975780.

It is an arithmetic number, because the mean of its divisors is an integer number (1164943845).

Almost surely, 2^20431321110 is an apocalyptic number.

20431321110 is an abundant number, since it is smaller than the sum of its proper divisors (35485983450).

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

20431321110 is a wasteful number, since it uses less digits than its factorization.

20431321110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11948173 (or 11948170 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 20431321110 its reverse (1112313402), we get a palindrome (21543634512).

The spelling of 20431321110 in words is "twenty billion, four hundred thirty-one million, three hundred twenty-one thousand, one hundred ten".