20448449 has 16 divisors (see below), whose sum is σ = 24634368. Its totient is φ = 16594512.

The previous prime is 20448443. The next prime is 20448469. The reversal of 20448449 is 94484402.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20448449 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20448443) 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, 16634 + ... + 17820.

It is an arithmetic number, because the mean of its divisors is an integer number (1539648).

Almost surely, 2^20448449 is an apocalyptic number.

It is an amenable number.

20448449 is a deficient number, since it is larger than the sum of its proper divisors (4185919).

20448449 is a wasteful number, since it uses less digits than its factorization.

20448449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1324.

The product of its (nonzero) digits is 36864, while the sum is 35.

The square root of 20448449 is about 4521.9961300293. The cubic root of 20448449 is about 273.4555806863.

Adding to 20448449 its sum of digits (35), we get a square (20448484 = 4522²).

The spelling of 20448449 in words is "twenty million, four hundred forty-eight thousand, four hundred forty-nine".