20402440044 has 96 divisors (see below), whose sum is σ = 57666825216. Its totient is φ = 5480663040.

The previous prime is 20402439997. The next prime is 20402440067. The reversal of 20402440044 is 44004420402.

It is a junction number, because it is equal to n+sod(n) for n = 20402439996 and 20402440023.

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, 1468209 + ... + 1482039.

It is an arithmetic number, because the mean of its divisors is an integer number (600696096).

Almost surely, 2^20402440044 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 20402440044, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28833412608).

20402440044 is an abundant number, since it is smaller than the sum of its proper divisors (37264385172).

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

20402440044 is a wasteful number, since it uses less digits than its factorization.

20402440044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14895 (or 14893 counting only the distinct ones).

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

Adding to 20402440044 its reverse (44004420402), we get a palindrome (64406860446).

The spelling of 20402440044 in words is "twenty billion, four hundred two million, four hundred forty thousand, forty-four".