20257271 has 2 divisors, whose sum is σ = 20257272. Its totient is φ = 20257270.

The previous prime is 20257261. The next prime is 20257297. The reversal of 20257271 is 17275202.

It is an a-pointer prime, because the next prime (20257297) can be obtained adding 20257271 to its sum of digits (26).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20257271 - 2¹⁸ = 19995127 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20257271.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20257261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10128635 + 10128636.

It is an arithmetic number, because the mean of its divisors is an integer number (10128636).

Almost surely, 2^20257271 is an apocalyptic number.

20257271 is a deficient number, since it is larger than the sum of its proper divisors (1).

20257271 is an equidigital number, since it uses as much as digits as its factorization.

20257271 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1960, while the sum is 26.

The square root of 20257271 is about 4500.8078163814. The cubic root of 20257271 is about 272.6007079441.

The spelling of 20257271 in words is "twenty million, two hundred fifty-seven thousand, two hundred seventy-one".