20444244013 has 8 divisors (see below), whose sum is σ = 21655644408. Its totient is φ = 19233821184.

The previous prime is 20444243993. The next prime is 20444244053. The reversal of 20444244013 is 31044244402.

It can be written as a sum of positive squares in 4 ways, for example, as 15021688969 + 5422555044 = 122563^2 + 73638^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20444244013 - 2²⁵ = 20410689581 is a prime.

It is a super-2 number, since 2×20444244013² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20444244053) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 201106 + ... + 285187.

It is an arithmetic number, because the mean of its divisors is an integer number (2706955551).

Almost surely, 2^20444244013 is an apocalyptic number.

It is an amenable number.

20444244013 is a deficient number, since it is larger than the sum of its proper divisors (1211400395).

20444244013 is a wasteful number, since it uses less digits than its factorization.

20444244013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 488783.

The product of its (nonzero) digits is 12288, while the sum is 28.

Adding to 20444244013 its reverse (31044244402), we get a palindrome (51488488415).

The spelling of 20444244013 in words is "twenty billion, four hundred forty-four million, two hundred forty-four thousand, thirteen".