20909744 has 20 divisors (see below), whose sum is σ = 40626120. Its totient is φ = 10425600.

The previous prime is 20909743. The next prime is 20909753. The reversal of 20909744 is 44790902.

It is not an unprimeable number, because it can be changed into a prime (20909741) 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, 4787 + ... + 8045.

It is an arithmetic number, because the mean of its divisors is an integer number (2031306).

Almost surely, 2^20909744 is an apocalyptic number.

It is an amenable number.

20909744 is a deficient number, since it is larger than the sum of its proper divisors (19716376).

20909744 is a wasteful number, since it uses less digits than its factorization.

20909744 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3668 (or 3662 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 20909744 is about 4572.7173540467. The cubic root of 20909744 is about 275.4965969169.

The spelling of 20909744 in words is "twenty million, nine hundred nine thousand, seven hundred forty-four".