20402440244 has 6 divisors (see below), whose sum is σ = 35704270434. Its totient is φ = 10201220120.

The previous prime is 20402440243. The next prime is 20402440249. The reversal of 20402440244 is 44204420402.

It can be written as a sum of positive squares in only one way, i.e., 19268771344 + 1133668900 = 138812^2 + 33670^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20402440241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2550305027 + ... + 2550305034.

It is an arithmetic number, because the mean of its divisors is an integer number (5950711739).

Almost surely, 2^20402440244 is an apocalyptic number.

It is an amenable number.

20402440244 is a deficient number, since it is larger than the sum of its proper divisors (15301830190).

20402440244 is a wasteful number, since it uses less digits than its factorization.

20402440244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5100610065 (or 5100610063 counting only the distinct ones).

The product of its (nonzero) digits is 8192, while the sum is 26.

Adding to 20402440244 its reverse (44204420402), we get a palindrome (64606860646).

The spelling of 20402440244 in words is "twenty billion, four hundred two million, four hundred forty thousand, two hundred forty-four".