20440413240 has 128 divisors (see below), whose sum is σ = 66107059200. Its totient is φ = 5026245120.

The previous prime is 20440413113. The next prime is 20440413247. The reversal of 20440413240 is 4231404402.

It is a happy number.

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 20440413240.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20440413247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1614535 + ... + 1627145.

It is an arithmetic number, because the mean of its divisors is an integer number (516461400).

Almost surely, 2^20440413240 is an apocalyptic number.

20440413240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20440413240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33053529600).

20440413240 is an abundant number, since it is smaller than the sum of its proper divisors (45666645960).

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

20440413240 is a wasteful number, since it uses less digits than its factorization.

20440413240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13677 (or 13673 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 24.

Adding to 20440413240 its reverse (4231404402), we get a palindrome (24671817642).

The spelling of 20440413240 in words is "twenty billion, four hundred forty million, four hundred thirteen thousand, two hundred forty".