20943 has 12 divisors (see below), whose sum is σ = 32760. Its totient is φ = 12816.

The previous prime is 20939. The next prime is 20947. The reversal of 20943 is 34902.

It is an interprime number because it is at equal distance from previous prime (20939) and next prime (20947).

It is not a de Polignac number, because 20943 - 2² = 20939 is a prime.

It is a plaindrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20947) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 28 + ... + 206.

It is an arithmetic number, because the mean of its divisors is an integer number (2730).

2²⁰⁹⁴³ is an apocalyptic number.

20943 is a deficient number, since it is larger than the sum of its proper divisors (11817).

20943 is a wasteful number, since it uses less digits than its factorization.

20943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198 (or 195 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 20943 is about 144.7169651423. The cubic root of 20943 is about 27.5642574504.

It can be divided in two parts, 209 and 43, that added together give a palindrome (252).

The spelling of 20943 in words is "twenty thousand, nine hundred forty-three".