20330 has 16 divisors (see below), whose sum is σ = 38880.
Its totient is φ = 7632.
The previous prime is 20327. The next prime is 20333. The reversal of 20330 is 3302.
Multipling 20330 by its product of nonzero digits (18), we get a triangular number (365940 = T855).
Adding to 20330 its reverse (3302), we get a palindrome (23632).
It is an interprime number because it is at equal distance from previous prime (20327) and next prime (20333).
It is a nialpdrome in base 12.
It is not an unprimeable number, because it can be changed into a prime (20333) 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, 137 + ... + 243.
It is an arithmetic number, because the mean of its divisors is an integer number (2430).
220330 is an apocalyptic number.
20330 is a deficient number, since it is larger than the sum of its proper divisors (18550).
20330 is a wasteful number, since it uses less digits than its factorization.
20330 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 133.
The product of its (nonzero) digits is 18, while the sum is 8.
The square root of 20330 is about 142.5833089811.
The cubic root of 20330 is about 27.2926554686.
The spelling of 20330 in words is "twenty thousand, three hundred thirty".