20343 has 4 divisors (see below), whose sum is σ = 27128. Its totient is φ = 13560.

The previous prime is 20341. The next prime is 20347. The reversal of 20343 is 34302.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 20343 - 2¹ = 20341 is a prime.

It is a D-number.

It is a Duffinian number.

It is a plaindrome in base 5.

It is a nialpdrome in base 12.

It is a zygodrome in base 5.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20341) 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, 3388 + ... + 3393.

It is an arithmetic number, because the mean of its divisors is an integer number (6782).

2²⁰³⁴³ is an apocalyptic number.

20343 is a deficient number, since it is larger than the sum of its proper divisors (6785).

20343 is an equidigital number, since it uses as much as digits as its factorization.

20343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6784.

The product of its (nonzero) digits is 72, while the sum is 12.

The square root of 20343 is about 142.6288890793. The cubic root of 20343 is about 27.2984716503.

Adding to 20343 its reverse (34302), we get a palindrome (54645).

It can be divided in two parts, 20 and 343, that added together give a palindrome (363).

The spelling of 20343 in words is "twenty thousand, three hundred forty-three", and thus it is an iban number.