20332291 has 4 divisors (see below), whose sum is σ = 23236912. Its totient is φ = 17427672.

The previous prime is 20332283. The next prime is 20332297. The reversal of 20332291 is 19223302.

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

It is a cyclic number.

It is not a de Polignac number, because 20332291 - 2³ = 20332283 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20332297) 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, 1452300 + ... + 1452313.

It is an arithmetic number, because the mean of its divisors is an integer number (5809228).

Almost surely, 2^20332291 is an apocalyptic number.

20332291 is a deficient number, since it is larger than the sum of its proper divisors (2904621).

20332291 is an equidigital number, since it uses as much as digits as its factorization.

20332291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2904620.

The product of its (nonzero) digits is 648, while the sum is 22.

The square root of 20332291 is about 4509.1341740960. The cubic root of 20332291 is about 272.9368063869.

Adding to 20332291 its reverse (19223302), we get a palindrome (39555593).

The spelling of 20332291 in words is "twenty million, three hundred thirty-two thousand, two hundred ninety-one".