20400234404 has 24 divisors (see below), whose sum is σ = 39048693600. Its totient is φ = 9248359680.

The previous prime is 20400234403. The next prime is 20400234509. The reversal of 20400234404 is 40443200402.

It is a self number, because there is not a number n which added to its sum of digits gives 20400234404.

It is not an unprimeable number, because it can be changed into a prime (20400234403) 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 7 ways as a sum of consecutive naturals, for example, 594989 + ... + 628340.

It is an arithmetic number, because the mean of its divisors is an integer number (1627028900).

Almost surely, 2^20400234404 is an apocalyptic number.

It is an amenable number.

20400234404 is a deficient number, since it is larger than the sum of its proper divisors (18648459196).

20400234404 is a wasteful number, since it uses less digits than its factorization.

20400234404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1223723 (or 1223721 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 23.

Adding to 20400234404 its reverse (40443200402), we get a palindrome (60843434806).

The spelling of 20400234404 in words is "twenty billion, four hundred million, two hundred thirty-four thousand, four hundred four".