20144440013 has 4 divisors (see below), whose sum is σ = 20154122268. Its totient is φ = 20134757760.

The previous prime is 20144439989. The next prime is 20144440021. The reversal of 20144440013 is 31004444102.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12468402244 + 7676037769 = 111662^2 + 87613^2 .

It is a cyclic number.

It is not a de Polignac number, because 20144440013 - 2¹⁶ = 20144374477 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20144440073) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4838006 + ... + 4842167.

It is an arithmetic number, because the mean of its divisors is an integer number (5038530567).

Almost surely, 2^20144440013 is an apocalyptic number.

It is an amenable number.

20144440013 is a deficient number, since it is larger than the sum of its proper divisors (9682255).

20144440013 is an equidigital number, since it uses as much as digits as its factorization.

20144440013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9682254.

The product of its (nonzero) digits is 1536, while the sum is 23.

Adding to 20144440013 its reverse (31004444102), we get a palindrome (51148884115).

The spelling of 20144440013 in words is "twenty billion, one hundred forty-four million, four hundred forty thousand, thirteen".