20442 has 8 divisors (see below), whose sum is σ = 40896. Its totient is φ = 6812.

The previous prime is 20441. The next prime is 20443. The reversal of 20442 is 24402.

It is an interprime number because it is at equal distance from previous prime (20441) and next prime (20443).

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

20442 is an admirable number.

It is a nialpdrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (20441) 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, 1698 + ... + 1709.

It is an arithmetic number, because the mean of its divisors is an integer number (5112).

2²⁰⁴⁴² is an apocalyptic number.

20442 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20448).

20442 is a wasteful number, since it uses less digits than its factorization.

20442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3412.

The product of its (nonzero) digits is 64, while the sum is 12.

The square root of 20442 is about 142.9755223806. The cubic root of 20442 is about 27.3426830332.

Adding to 20442 its reverse (24402), we get a palindrome (44844).

The spelling of 20442 in words is "twenty thousand, four hundred forty-two", and thus it is an iban number.