20705144 has 16 divisors (see below), whose sum is σ = 39402600. Its totient is φ = 10197792.

The previous prime is 20705137. The next prime is 20705147. The reversal of 20705144 is 44150702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20705147) 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 in 3 ways as a sum of consecutive naturals, for example, 18779 + ... + 19850.

Almost surely, 2^20705144 is an apocalyptic number.

It is an amenable number.

20705144 is a deficient number, since it is larger than the sum of its proper divisors (18697456).

20705144 is a wasteful number, since it uses less digits than its factorization.

20705144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38702 (or 38698 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 23.

The square root of 20705144 is about 4550.2905401743. The cubic root of 20705144 is about 274.5950801071.

Adding to 20705144 its reverse (44150702), we get a palindrome (64855846).

The spelling of 20705144 in words is "twenty million, seven hundred five thousand, one hundred forty-four".