20321344431 has 12 divisors (see below), whose sum is σ = 29418433200. Its totient is φ = 13517387520.

The previous prime is 20321344423. The next prime is 20321344447. The reversal of 20321344431 is 13444312302.

20321344431 is a `hidden beast` number, since 2 + 0 + 3 + 213 + 4 + 443 + 1 = 666.

It is not a de Polignac number, because 20321344431 - 2³ = 20321344423 is a prime.

It is a super-2 number, since 2×20321344431² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20321344395 and 20321344404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20321344411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2510355 + ... + 2518436.

It is an arithmetic number, because the mean of its divisors is an integer number (2451536100).

Almost surely, 2^20321344431 is an apocalyptic number.

20321344431 is a deficient number, since it is larger than the sum of its proper divisors (9097088769).

20321344431 is a wasteful number, since it uses less digits than its factorization.

20321344431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5029246 (or 5029243 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 27.

Adding to 20321344431 its reverse (13444312302), we get a palindrome (33765656733).

The spelling of 20321344431 in words is "twenty billion, three hundred twenty-one million, three hundred forty-four thousand, four hundred thirty-one".