20343256 has 16 divisors (see below), whose sum is σ = 38769840. Its totient is φ = 10004640.

The previous prime is 20343227. The next prime is 20343263. The reversal of 20343256 is 65234302.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 20343256.

It is a congruent number.

It is an unprimeable number.

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, 20356 + ... + 21331.

It is an arithmetic number, because the mean of its divisors is an integer number (2423115).

Almost surely, 2^20343256 is an apocalyptic number.

It is an amenable number.

20343256 is a deficient number, since it is larger than the sum of its proper divisors (18426584).

20343256 is a wasteful number, since it uses less digits than its factorization.

20343256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41754 (or 41750 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 25.

The square root of 20343256 is about 4510.3498755640. The cubic root of 20343256 is about 272.9858615943.

Adding to 20343256 its reverse (65234302), we get a palindrome (85577558).

The spelling of 20343256 in words is "twenty million, three hundred forty-three thousand, two hundred fifty-six".