20333221 has 4 divisors (see below), whose sum is σ = 20345344. Its totient is φ = 20321100.

The previous prime is 20333213. The next prime is 20333231. The reversal of 20333221 is 12233302.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20333221 - 2³ = 20333213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20333195 and 20333204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20333231) 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, 3045 + ... + 7066.

It is an arithmetic number, because the mean of its divisors is an integer number (5086336).

Almost surely, 2^20333221 is an apocalyptic number.

It is an amenable number.

20333221 is a deficient number, since it is larger than the sum of its proper divisors (12123).

20333221 is a wasteful number, since it uses less digits than its factorization.

20333221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12122.

The product of its (nonzero) digits is 216, while the sum is 16.

The square root of 20333221 is about 4509.2372969273. The cubic root of 20333221 is about 272.9409677045.

Adding to 20333221 its reverse (12233302), we get a palindrome (32566523).

The spelling of 20333221 in words is "twenty million, three hundred thirty-three thousand, two hundred twenty-one".