20404044240 has 80 divisors (see below), whose sum is σ = 63878875776. Its totient is φ = 5387200000.

The previous prime is 20404044233. The next prime is 20404044259. The reversal of 20404044240 is 4244040402.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 20404044240.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 396636 + ... + 445115.

Almost surely, 2^20404044240 is an apocalyptic number.

20404044240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20404044240 is an abundant number, since it is smaller than the sum of its proper divisors (43474831536).

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

20404044240 is a wasteful number, since it uses less digits than its factorization.

20404044240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 841868 (or 841862 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 24.

Adding to 20404044240 its reverse (4244040402), we get a palindrome (24648084642).

The spelling of 20404044240 in words is "twenty billion, four hundred four million, forty-four thousand, two hundred forty".