20440240404 has 96 divisors (see below), whose sum is σ = 51561861120. Its totient is φ = 6288551808.

The previous prime is 20440240391. The next prime is 20440240421. The reversal of 20440240404 is 40404204402.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 688777 + ... + 717839.

It is an arithmetic number, because the mean of its divisors is an integer number (537102720).

Almost surely, 2^20440240404 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20440240404, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25780930560).

20440240404 is an abundant number, since it is smaller than the sum of its proper divisors (31121620716).

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

20440240404 is a wasteful number, since it uses less digits than its factorization.

20440240404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29189 (or 29187 counting only the distinct ones).

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

Adding to 20440240404 its reverse (40404204402), we get a palindrome (60844444806).

The spelling of 20440240404 in words is "twenty billion, four hundred forty million, two hundred forty thousand, four hundred four".