20840244 has 12 divisors (see below), whose sum is σ = 48627264. Its totient is φ = 6946744.

The previous prime is 20840233. The next prime is 20840263. The reversal of 20840244 is 44204802.

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

It is a congruent number.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 868332 + ... + 868355.

It is an arithmetic number, because the mean of its divisors is an integer number (4052272).

Almost surely, 2^20840244 is an apocalyptic number.

It is an amenable number.

20840244 is an abundant number, since it is smaller than the sum of its proper divisors (27787020).

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

20840244 is a wasteful number, since it uses less digits than its factorization.

20840244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1736694 (or 1736692 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 24.

The square root of 20840244 is about 4565.1116087123. Note that the first 3 decimals coincide. The cubic root of 20840244 is about 275.1910254025.

The spelling of 20840244 in words is "twenty million, eight hundred forty thousand, two hundred forty-four".