20197271 has 2 divisors, whose sum is σ = 20197272. Its totient is φ = 20197270.

The previous prime is 20197249. The next prime is 20197277. The reversal of 20197271 is 17279102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20197271 - 2¹⁸ = 19935127 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20197277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10098635 + 10098636.

It is an arithmetic number, because the mean of its divisors is an integer number (10098636).

Almost surely, 2^20197271 is an apocalyptic number.

20197271 is a deficient number, since it is larger than the sum of its proper divisors (1).

20197271 is an equidigital number, since it uses as much as digits as its factorization.

20197271 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1764, while the sum is 29.

The square root of 20197271 is about 4494.1374033289. The cubic root of 20197271 is about 272.3313031557.

The spelling of 20197271 in words is "twenty million, one hundred ninety-seven thousand, two hundred seventy-one".