20540244 has 12 divisors (see below), whose sum is σ = 47927264. Its totient is φ = 6846744.

The previous prime is 20540243. The next prime is 20540249. The reversal of 20540244 is 44204502.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 20540244.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20540243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 855832 + ... + 855855.

Almost surely, 2^20540244 is an apocalyptic number.

It is an amenable number.

20540244 is an abundant number, since it is smaller than the sum of its proper divisors (27387020).

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

20540244 is a wasteful number, since it uses less digits than its factorization.

20540244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1711694 (or 1711692 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 21.

The square root of 20540244 is about 4532.1345964126. The cubic root of 20540244 is about 273.8641591381.

Adding to 20540244 its reverse (44204502), we get a palindrome (64744746).

The spelling of 20540244 in words is "twenty million, five hundred forty thousand, two hundred forty-four".