20338289 has 4 divisors (see below), whose sum is σ = 20370660. Its totient is φ = 20305920.

The previous prime is 20338267. The next prime is 20338301. The reversal of 20338289 is 98283302.

20338289 is nontrivially palindromic in base 4.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 18879025 + 1459264 = 4345^2 + 1208^2 .

It is a cyclic number.

It is not a de Polignac number, because 20338289 - 2²⁴ = 3561073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20338229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15224 + ... + 16505.

It is an arithmetic number, because the mean of its divisors is an integer number (5092665).

Almost surely, 2^20338289 is an apocalyptic number.

It is an amenable number.

20338289 is a deficient number, since it is larger than the sum of its proper divisors (32371).

20338289 is an equidigital number, since it uses as much as digits as its factorization.

20338289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32370.

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 20338289 is about 4509.7992194775. The cubic root of 20338289 is about 272.9636424185.

The spelling of 20338289 in words is "twenty million, three hundred thirty-eight thousand, two hundred eighty-nine".