20444 has 12 divisors (see below), whose sum is σ = 37800.
Its totient is φ = 9648.
The previous prime is 20443. The next prime is 20477. The reversal of 20444 is 44402.
20444 = 472 + 482 + ... + 542.
20444 is a modest number, since divided by 444 gives 20 as remainder.
It is a nialpdrome in base 14.
It is a congruent number.
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, 59 + ... + 210.
It is an arithmetic number, because the mean of its divisors is an integer number (3150).
220444 is an apocalyptic number.
It is an amenable number.
20444 is a deficient number, since it is larger than the sum of its proper divisors (17356).
20444 is a wasteful number, since it uses less digits than its factorization.
20444 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 292 (or 290 counting only the distinct ones).
The product of its (nonzero) digits is 128, while the sum is 14.
The square root of 20444 is about 142.9825164137.
The cubic root of 20444 is about 27.3435747200.
Adding to 20444 its reverse (44402), we get a palindrome (64846).
It can be divided in two parts, 2044 and 4, that added together give a 11-th power (2048 = 211).
The spelling of 20444 in words is "twenty thousand, four hundred forty-four", and thus it is an iban number.