20383 has 8 divisors (see below), whose sum is σ = 23760. Its totient is φ = 17280.

The previous prime is 20369. The next prime is 20389. The reversal of 20383 is 38302.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20383 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20389) 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 7 ways as a sum of consecutive naturals, for example, 133 + ... + 241.

It is an arithmetic number, because the mean of its divisors is an integer number (2970).

2²⁰³⁸³ is an apocalyptic number.

20383 is a deficient number, since it is larger than the sum of its proper divisors (3377).

20383 is a wasteful number, since it uses less digits than its factorization.

20383 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 20383 is about 142.7690442638. The cubic root of 20383 is about 27.3163520671.

Adding to 20383 its reverse (38302), we get a palindrome (58685).

The spelling of 20383 in words is "twenty thousand, three hundred eighty-three".