20430321 has 8 divisors (see below), whose sum is σ = 27624384. Its totient is φ = 13428240.

The previous prime is 20430307. The next prime is 20430323. The reversal of 20430321 is 12303402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20430321 - 2¹¹ = 20428273 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20430321.

It is not an unprimeable number, because it can be changed into a prime (20430323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47746 + ... + 48171.

It is an arithmetic number, because the mean of its divisors is an integer number (3453048).

Almost surely, 2^20430321 is an apocalyptic number.

It is an amenable number.

20430321 is a deficient number, since it is larger than the sum of its proper divisors (7194063).

20430321 is an equidigital number, since it uses as much as digits as its factorization.

20430321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95991.

The product of its (nonzero) digits is 144, while the sum is 15.

The square root of 20430321 is about 4519.9912610535. The cubic root of 20430321 is about 273.3747486653.

Adding to 20430321 its reverse (12303402), we get a palindrome (32733723).

The spelling of 20430321 in words is "twenty million, four hundred thirty thousand, three hundred twenty-one".