20865486549 has 16 divisors (see below), whose sum is σ = 27959500800. Its totient is φ = 13840992816.

The previous prime is 20865486533. The next prime is 20865486599. The reversal of 20865486549 is 94568456802.

It is a happy number.

It is not a de Polignac number, because 20865486549 - 2⁴ = 20865486533 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20865486599) 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, 934692 + ... + 956754.

It is an arithmetic number, because the mean of its divisors is an integer number (1747468800).

Almost surely, 2^20865486549 is an apocalyptic number.

It is an amenable number.

20865486549 is a deficient number, since it is larger than the sum of its proper divisors (7094014251).

20865486549 is a wasteful number, since it uses less digits than its factorization.

20865486549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23624.

The product of its (nonzero) digits is 16588800, while the sum is 57.

The spelling of 20865486549 in words is "twenty billion, eight hundred sixty-five million, four hundred eighty-six thousand, five hundred forty-nine".