20304889 has 6 divisors (see below), whose sum is σ = 22318730. Its totient is φ = 18458880.

The previous prime is 20304839. The next prime is 20304899. The reversal of 20304889 is 98840302.

It can be written as a sum of positive squares in only one way, i.e., 17472400 + 2832489 = 4180^2 + 1683^2 .

It is not a de Polignac number, because 20304889 - 2¹⁹ = 19780601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20304829) 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, 83784 + ... + 84025.

Almost surely, 2^20304889 is an apocalyptic number.

It is an amenable number.

20304889 is a deficient number, since it is larger than the sum of its proper divisors (2013841).

20304889 is a wasteful number, since it uses less digits than its factorization.

20304889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167831 (or 167820 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 34.

The square root of 20304889 is about 4506.0946505816. The cubic root of 20304889 is about 272.8141381851.

The spelling of 20304889 in words is "twenty million, three hundred four thousand, eight hundred eighty-nine".