20402034444 has 144 divisors (see below), whose sum is σ = 57002714496. Its totient is φ = 6101222400.

The previous prime is 20402034437. The next prime is 20402034449. The reversal of 20402034444 is 44443020402.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (20402034449) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 21010879 + ... + 21011849.

It is an arithmetic number, because the mean of its divisors is an integer number (395852184).

Almost surely, 2^20402034444 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 20402034444, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28501357248).

20402034444 is an abundant number, since it is smaller than the sum of its proper divisors (36600680052).

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

20402034444 is a wasteful number, since it uses less digits than its factorization.

20402034444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1636 (or 1631 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 27.

Adding to 20402034444 its reverse (44443020402), we get a palindrome (64845054846).

The spelling of 20402034444 in words is "twenty billion, four hundred two million, thirty-four thousand, four hundred forty-four".