20449443885 has 48 divisors (see below), whose sum is σ = 35824344192. Its totient is φ = 9902027520.

The previous prime is 20449443881. The next prime is 20449443887. The reversal of 20449443885 is 58834494402.

It is not a de Polignac number, because 20449443885 - 2² = 20449443881 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20449443881) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 711504 + ... + 739686.

It is an arithmetic number, because the mean of its divisors is an integer number (746340504).

Almost surely, 2^20449443885 is an apocalyptic number.

It is an amenable number.

20449443885 is a deficient number, since it is larger than the sum of its proper divisors (15374900307).

20449443885 is a wasteful number, since it uses less digits than its factorization.

20449443885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28326 (or 28265 counting only the distinct ones).

The product of its (nonzero) digits is 4423680, while the sum is 51.

The spelling of 20449443885 in words is "twenty billion, four hundred forty-nine million, four hundred forty-three thousand, eight hundred eighty-five".