204402423431 has 4 divisors (see below), whose sum is σ = 204405815832. Its totient is φ = 204399031032.

The previous prime is 204402423367. The next prime is 204402423437. The reversal of 204402423431 is 134324204402.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 204402423431 - 2⁶ = 204402423367 is a prime.

It is a super-2 number, since 2×204402423431² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 204402423394 and 204402423403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204402423437) 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 3 ways as a sum of consecutive naturals, for example, 1604156 + ... + 1726881.

It is an arithmetic number, because the mean of its divisors is an integer number (51101453958).

Almost surely, 2^204402423431 is an apocalyptic number.

204402423431 is a deficient number, since it is larger than the sum of its proper divisors (3392401).

204402423431 is an equidigital number, since it uses as much as digits as its factorization.

204402423431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3392400.

The product of its (nonzero) digits is 18432, while the sum is 29.

Adding to 204402423431 its reverse (134324204402), we get a palindrome (338726627833).

The spelling of 204402423431 in words is "two hundred four billion, four hundred two million, four hundred twenty-three thousand, four hundred thirty-one".