20832289 has 4 divisors (see below), whose sum is σ = 20898324. Its totient is φ = 20766256.

The previous prime is 20832277. The next prime is 20832299. The reversal of 20832289 is 98223802.

It is a happy number.

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 3359889 + 17472400 = 1833^2 + 4180^2 .

It is a cyclic number.

It is not a de Polignac number, because 20832289 - 2¹¹ = 20830241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20832209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32542 + ... + 33175.

It is an arithmetic number, because the mean of its divisors is an integer number (5224581).

Almost surely, 2^20832289 is an apocalyptic number.

It is an amenable number.

20832289 is a deficient number, since it is larger than the sum of its proper divisors (66035).

20832289 is an equidigital number, since it uses as much as digits as its factorization.

20832289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66034.

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

The square root of 20832289 is about 4564.2402434578. The cubic root of 20832289 is about 275.1560062475.

The spelling of 20832289 in words is "twenty million, eight hundred thirty-two thousand, two hundred eighty-nine".