20440271 has 2 divisors, whose sum is σ = 20440272. Its totient is φ = 20440270.

The previous prime is 20440249. The next prime is 20440283. The reversal of 20440271 is 17204402.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20440271 - 2⁶ = 20440207 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20440201) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10220135 + 10220136.

It is an arithmetic number, because the mean of its divisors is an integer number (10220136).

Almost surely, 2^20440271 is an apocalyptic number.

20440271 is a deficient number, since it is larger than the sum of its proper divisors (1).

20440271 is an equidigital number, since it uses as much as digits as its factorization.

20440271 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 448, while the sum is 20.

The square root of 20440271 is about 4521.0917929191. The cubic root of 20440271 is about 273.4191212311.

Adding to 20440271 its reverse (17204402), we get a palindrome (37644673).

The spelling of 20440271 in words is "twenty million, four hundred forty thousand, two hundred seventy-one".