20431323 has 24 divisors (see below), whose sum is σ = 32887296. Its totient is φ = 12116400.

The previous prime is 20431319. The next prime is 20431343. The reversal of 20431323 is 32313402.

It is not a de Polignac number, because 20431323 - 2² = 20431319 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20431296 and 20431305.

It is not an unprimeable number, because it can be changed into a prime (20431303) 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, 2458 + ... + 6848.

It is an arithmetic number, because the mean of its divisors is an integer number (1370304).

Almost surely, 2^20431323 is an apocalyptic number.

20431323 is a deficient number, since it is larger than the sum of its proper divisors (12455973).

20431323 is a wasteful number, since it uses less digits than its factorization.

20431323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4455 (or 4452 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 18.

The square root of 20431323 is about 4520.1021006168. The cubic root of 20431323 is about 273.3792177910.

Adding to 20431323 its reverse (32313402), we get a palindrome (52744725).

The spelling of 20431323 in words is "twenty million, four hundred thirty-one thousand, three hundred twenty-three".