20942 has 8 divisors (see below), whose sum is σ = 32376. Its totient is φ = 10152.

The previous prime is 20939. The next prime is 20947. The reversal of 20942 is 24902.

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

It is a plaindrome in base 14.

It is a self number, because there is not a number n which added to its sum of digits gives 20942.

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 3 ways as a sum of consecutive naturals, for example, 68 + ... + 215.

It is an arithmetic number, because the mean of its divisors is an integer number (4047).

2²⁰⁹⁴² is an apocalyptic number.

20942 is a deficient number, since it is larger than the sum of its proper divisors (11434).

20942 is a wasteful number, since it uses less digits than its factorization.

20942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 20942 is about 144.7135100811. The cubic root of 20942 is about 27.5638187247.

It can be divided in two parts, 209 and 42, that multiplied together give a palindrome (8778).

The spelling of 20942 in words is "twenty thousand, nine hundred forty-two".