20445538839 has 16 divisors (see below), whose sum is σ = 30464308224. Its totient is φ = 12089009600.

The previous prime is 20445538823. The next prime is 20445538843. The reversal of 20445538839 is 93883554402.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 20445538839 - 2⁴ = 20445538823 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20445538791 and 20445538800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20445538039) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7554279 + ... + 7556984.

It is an arithmetic number, because the mean of its divisors is an integer number (1904019264).

Almost surely, 2^20445538839 is an apocalyptic number.

20445538839 is a deficient number, since it is larger than the sum of its proper divisors (10018769385).

20445538839 is a wasteful number, since it uses less digits than its factorization.

20445538839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15111318.

The product of its (nonzero) digits is 4147200, while the sum is 51.

The spelling of 20445538839 in words is "twenty billion, four hundred forty-five million, five hundred thirty-eight thousand, eight hundred thirty-nine".