20544439 has 2 divisors, whose sum is σ = 20544440. Its totient is φ = 20544438.

The previous prime is 20544427. The next prime is 20544473. The reversal of 20544439 is 93444502.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20544439 - 2⁹ = 20543927 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20544439.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20548439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10272219 + 10272220.

It is an arithmetic number, because the mean of its divisors is an integer number (10272220).

Almost surely, 2^20544439 is an apocalyptic number.

20544439 is a deficient number, since it is larger than the sum of its proper divisors (1).

20544439 is an equidigital number, since it uses as much as digits as its factorization.

20544439 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17280, while the sum is 31.

The square root of 20544439 is about 4532.5973789870. The cubic root of 20544439 is about 273.8828019213.

It can be divided in two parts, 205 and 44439, that added together give a palindrome (44644).

The spelling of 20544439 in words is "twenty million, five hundred forty-four thousand, four hundred thirty-nine".