20400230323 has 16 divisors (see below), whose sum is σ = 22790541312. Its totient is φ = 18099900000.

The previous prime is 20400230311. The next prime is 20400230359. The reversal of 20400230323 is 32303200402.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20400230323 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20400230323.

It is not an unprimeable number, because it can be changed into a prime (20400230303) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 598798 + ... + 631948.

It is an arithmetic number, because the mean of its divisors is an integer number (1424408832).

Almost surely, 2^20400230323 is an apocalyptic number.

20400230323 is a deficient number, since it is larger than the sum of its proper divisors (2390310989).

20400230323 is a wasteful number, since it uses less digits than its factorization.

20400230323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34506.

The product of its (nonzero) digits is 864, while the sum is 19.

Adding to 20400230323 its reverse (32303200402), we get a palindrome (52703430725).

The spelling of 20400230323 in words is "twenty billion, four hundred million, two hundred thirty thousand, three hundred twenty-three".