20441 has 2 divisors, whose sum is σ = 20442. Its totient is φ = 20440.

The previous prime is 20431. The next prime is 20443. The reversal of 20441 is 14402.

20441 is an esthetic number in base 6, because in such base its adjacent digits differ by 1.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19600 + 841 = 140^2 + 29^2 .

It is a cyclic number.

It is not a de Polignac number, because 20441 - 2¹⁰ = 19417 is a prime.

It is a Sophie Germain prime.

Together with 20443, it forms a pair of twin primes.

It is a Chen prime.

It is an Ulam number.

It is a Curzon number.

It is a nialpdrome in base 14.

It is not a weakly prime, because it can be changed into another prime (20443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10220 + 10221.

It is an arithmetic number, because the mean of its divisors is an integer number (10221).

2²⁰⁴⁴¹ is an apocalyptic number.

It is an amenable number.

20441 is a deficient number, since it is larger than the sum of its proper divisors (1).

20441 is an equidigital number, since it uses as much as digits as its factorization.

20441 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 11.

The square root of 20441 is about 142.9720252357. The cubic root of 20441 is about 27.3422371680.

Adding to 20441 its reverse (14402), we get a palindrome (34843).

The spelling of 20441 in words is "twenty thousand, four hundred forty-one", and thus it is an iban number.