20804449 has 8 divisors (see below), whose sum is σ = 21945440. Its totient is φ = 19668096.

The previous prime is 20804437. The next prime is 20804473. The reversal of 20804449 is 94440802.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20804449 - 2¹¹ = 20802401 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20804449.

It is not an unprimeable number, because it can be changed into a prime (20804479) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11974 + ... + 13600.

It is an arithmetic number, because the mean of its divisors is an integer number (2743180).

Almost surely, 2^20804449 is an apocalyptic number.

It is an amenable number.

20804449 is a deficient number, since it is larger than the sum of its proper divisors (1140991).

20804449 is a wasteful number, since it uses less digits than its factorization.

20804449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2319.

The product of its (nonzero) digits is 9216, while the sum is 31.

The square root of 20804449 is about 4561.1894282084. The cubic root of 20804449 is about 275.0333799702.

The spelling of 20804449 in words is "twenty million, eight hundred four thousand, four hundred forty-nine".