20330421 has 8 divisors (see below), whose sum is σ = 28042080. Its totient is φ = 13086192.

The previous prime is 20330411. The next prime is 20330467. The reversal of 20330421 is 12403302.

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

It is not a de Polignac number, because 20330421 - 2²¹ = 18233269 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20330421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20330411) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 116755 + ... + 116928.

It is an arithmetic number, because the mean of its divisors is an integer number (3505260).

Almost surely, 2^20330421 is an apocalyptic number.

It is an amenable number.

20330421 is a deficient number, since it is larger than the sum of its proper divisors (7711659).

20330421 is a wasteful number, since it uses less digits than its factorization.

20330421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 233715.

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

The square root of 20330421 is about 4508.9268124466. The cubic root of 20330421 is about 272.9284386223.

Adding to 20330421 its reverse (12403302), we get a palindrome (32733723).

The spelling of 20330421 in words is "twenty million, three hundred thirty thousand, four hundred twenty-one".