20644344244 has 6 divisors (see below), whose sum is σ = 36127602434. Its totient is φ = 10322172120.

The previous prime is 20644344241. The next prime is 20644344263. The reversal of 20644344244 is 44244344602.

It can be written as a sum of positive squares in only one way, i.e., 16156952100 + 4487392144 = 127110^2 + 66988^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20644344241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2580543027 + ... + 2580543034.

Almost surely, 2^20644344244 is an apocalyptic number.

It is an amenable number.

20644344244 is a deficient number, since it is larger than the sum of its proper divisors (15483258190).

20644344244 is a wasteful number, since it uses less digits than its factorization.

20644344244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5161086065 (or 5161086063 counting only the distinct ones).

The product of its (nonzero) digits is 294912, while the sum is 37.

Adding to 20644344244 its reverse (44244344602), we get a palindrome (64888688846).

The spelling of 20644344244 in words is "twenty billion, six hundred forty-four million, three hundred forty-four thousand, two hundred forty-four".