20490449 has 16 divisors (see below), whose sum is σ = 24331776. Its totient is φ = 16891200.

The previous prime is 20490439. The next prime is 20490451. The reversal of 20490449 is 94409402.

It is a cyclic number.

It is not a de Polignac number, because 20490449 - 2¹⁶ = 20424913 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20490419) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19559 + ... + 20579.

It is an arithmetic number, because the mean of its divisors is an integer number (1520736).

Almost surely, 2^20490449 is an apocalyptic number.

It is an amenable number.

20490449 is a deficient number, since it is larger than the sum of its proper divisors (3841327).

20490449 is a wasteful number, since it uses less digits than its factorization.

20490449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1136.

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 20490449 is about 4526.6377146840. The cubic root of 20490449 is about 273.6426736058.

The spelling of 20490449 in words is "twenty million, four hundred ninety thousand, four hundred forty-nine".