20249549649 has 96 divisors (see below), whose sum is σ = 36496179200. Its totient is φ = 10557786240.

The previous prime is 20249549641. The next prime is 20249549651. The reversal of 20249549649 is 94694594202.

20249549649 is a `hidden beast` number, since 2 + 0 + 24 + 95 + 496 + 49 = 666.

It is not a de Polignac number, because 20249549649 - 2³ = 20249549641 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20249549595 and 20249549604.

It is not an unprimeable number, because it can be changed into a prime (20249549641) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 8496312 + ... + 8498694.

Almost surely, 2^20249549649 is an apocalyptic number.

It is an amenable number.

20249549649 is a deficient number, since it is larger than the sum of its proper divisors (16246629551).

20249549649 is a wasteful number, since it uses less digits than its factorization.

20249549649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2675 (or 2672 counting only the distinct ones).

The product of its (nonzero) digits is 5598720, while the sum is 54.

The spelling of 20249549649 in words is "twenty billion, two hundred forty-nine million, five hundred forty-nine thousand, six hundred forty-nine".