20303289 has 12 divisors (see below), whose sum is σ = 29452800. Its totient is φ = 13477464.

The previous prime is 20303281. The next prime is 20303299. The reversal of 20303289 is 98230302.

It is not a de Polignac number, because 20303289 - 2³ = 20303281 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20303281) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2569 + ... + 6870.

It is an arithmetic number, because the mean of its divisors is an integer number (2454400).

Almost surely, 2^20303289 is an apocalyptic number.

It is an amenable number.

20303289 is a deficient number, since it is larger than the sum of its proper divisors (9149511).

20303289 is a wasteful number, since it uses less digits than its factorization.

20303289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9684 (or 9681 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 20303289 is about 4505.9171097569. The cubic root of 20303289 is about 272.8069721919.

The spelling of 20303289 in words is "twenty million, three hundred three thousand, two hundred eighty-nine".