20208271 has 4 divisors (see below), whose sum is σ = 20243872. Its totient is φ = 20172672.

The previous prime is 20208269. The next prime is 20208277. The reversal of 20208271 is 17280202.

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 20208271 - 2¹ = 20208269 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20208277) 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, 16935 + ... + 18088.

It is an arithmetic number, because the mean of its divisors is an integer number (5060968).

Almost surely, 2^20208271 is an apocalyptic number.

20208271 is a deficient number, since it is larger than the sum of its proper divisors (35601).

20208271 is an equidigital number, since it uses as much as digits as its factorization.

20208271 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35600.

The product of its (nonzero) digits is 448, while the sum is 22.

The square root of 20208271 is about 4495.3610533527. The cubic root of 20208271 is about 272.3807339371.

Adding to 20208271 its reverse (17280202), we get a palindrome (37488473).

The spelling of 20208271 in words is "twenty million, two hundred eight thousand, two hundred seventy-one".