20549449 has 4 divisors (see below), whose sum is σ = 20568964. Its totient is φ = 20529936.

The previous prime is 20549437. The next prime is 20549453. The reversal of 20549449 is 94494502.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 94494502 = 2 ⋅47247251.

It can be written as a sum of positive squares in 2 ways, for example, as 9259849 + 11289600 = 3043^2 + 3360^2 .

It is a cyclic number.

It is not a de Polignac number, because 20549449 - 2¹⁵ = 20516681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20541449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8082 + ... + 10315.

It is an arithmetic number, because the mean of its divisors is an integer number (5142241).

Almost surely, 2^20549449 is an apocalyptic number.

It is an amenable number.

20549449 is a deficient number, since it is larger than the sum of its proper divisors (19515).

20549449 is a wasteful number, since it uses less digits than its factorization.

20549449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19514.

The product of its (nonzero) digits is 51840, while the sum is 37.

The square root of 20549449 is about 4533.1500085481. The cubic root of 20549449 is about 273.9050632789.

The spelling of 20549449 in words is "twenty million, five hundred forty-nine thousand, four hundred forty-nine".