20150649 has 6 divisors (see below), whose sum is σ = 29106506. Its totient is φ = 13433760.

The previous prime is 20150633. The next prime is 20150677. The reversal of 20150649 is 94605102.

20150649 is a `hidden beast` number, since 2 + 0 + 15 + 0 + 649 = 666.

It can be written as a sum of positive squares in only one way, i.e., 19079424 + 1071225 = 4368^2 + 1035^2 .

It is not a de Polignac number, because 20150649 - 2⁴ = 20150633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20150699) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1119472 + ... + 1119489.

Almost surely, 2^20150649 is an apocalyptic number.

It is an amenable number.

20150649 is a deficient number, since it is larger than the sum of its proper divisors (8955857).

20150649 is a wasteful number, since it uses less digits than its factorization.

20150649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2238967 (or 2238964 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 20150649 is about 4488.9474267360. The cubic root of 20150649 is about 272.1215980606.

The spelling of 20150649 in words is "twenty million, one hundred fifty thousand, six hundred forty-nine".