20040400323 has 16 divisors (see below), whose sum is σ = 30713258400. Its totient is φ = 12899567520.

The previous prime is 20040400307. The next prime is 20040400363. The reversal of 20040400323 is 32300404002.

20040400323 is a `hidden beast` number, since 200 + 40 + 400 + 3 + 23 = 666.

It is not a de Polignac number, because 20040400323 - 2⁴ = 20040400307 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20040400296 and 20040400305.

It is not an unprimeable number, because it can be changed into a prime (20040400363) 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, 12796408 + ... + 12797973.

It is an arithmetic number, because the mean of its divisors is an integer number (1919578650).

Almost surely, 2^20040400323 is an apocalyptic number.

20040400323 is a deficient number, since it is larger than the sum of its proper divisors (10672858077).

20040400323 is a wasteful number, since it uses less digits than its factorization.

20040400323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25594419 (or 25594413 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 18.

Adding to 20040400323 its reverse (32300404002), we get a palindrome (52340804325).

The spelling of 20040400323 in words is "twenty billion, forty million, four hundred thousand, three hundred twenty-three".