20343571 has 4 divisors (see below), whose sum is σ = 20446000. Its totient is φ = 20241144.

The previous prime is 20343563. The next prime is 20343581. The reversal of 20343571 is 17534302.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20343571 - 2³ = 20343563 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20343581) 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, 50916 + ... + 51313.

It is an arithmetic number, because the mean of its divisors is an integer number (5111500).

Almost surely, 2^20343571 is an apocalyptic number.

20343571 is a deficient number, since it is larger than the sum of its proper divisors (102429).

20343571 is a wasteful number, since it uses less digits than its factorization.

20343571 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102428.

The product of its (nonzero) digits is 2520, while the sum is 25.

The square root of 20343571 is about 4510.3847951145. The cubic root of 20343571 is about 272.9872705805.

Adding to 20343571 its reverse (17534302), we get a palindrome (37877873).

The spelling of 20343571 in words is "twenty million, three hundred forty-three thousand, five hundred seventy-one".