20400204404 has 6 divisors (see below), whose sum is σ = 35700357714. Its totient is φ = 10200102200.

The previous prime is 20400204359. The next prime is 20400204431. The reversal of 20400204404 is 40440200402.

It can be written as a sum of positive squares in only one way, i.e., 19082659600 + 1317544804 = 138140^2 + 36298^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2550025547 + ... + 2550025554.

It is an arithmetic number, because the mean of its divisors is an integer number (5950059619).

Almost surely, 2^20400204404 is an apocalyptic number.

It is an amenable number.

20400204404 is a deficient number, since it is larger than the sum of its proper divisors (15300153310).

20400204404 is a wasteful number, since it uses less digits than its factorization.

20400204404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5100051105 (or 5100051103 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 20.

Adding to 20400204404 its reverse (40440200402), we get a palindrome (60840404806).

The spelling of 20400204404 in words is "twenty billion, four hundred million, two hundred four thousand, four hundred four".