20404400004 has 36 divisors (see below), whose sum is σ = 51595500684. Its totient is φ = 6799131072.

The previous prime is 20404399937. The next prime is 20404400011. The reversal of 20404400004 is 40000440402.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 10000400004 + 10404000000 = 100002^2 + 102000^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a self number, because there is not a number n which added to its sum of digits gives 20404400004.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10614 + ... + 202290.

Almost surely, 2^20404400004 is an apocalyptic number.

It is an amenable number.

20404400004 is an abundant number, since it is smaller than the sum of its proper divisors (31191100680).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20404400004 is a wasteful number, since it uses less digits than its factorization.

20404400004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194644 (or 194639 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 18.

Adding to 20404400004 its reverse (40000440402), we get a palindrome (60404840406).

It can be divided in two parts, 2040 and 4400004, that added together give a palindrome (4402044).

The spelling of 20404400004 in words is "twenty billion, four hundred four million, four hundred thousand, four".