20538513271 has 2 divisors, whose sum is σ = 20538513272. Its totient is φ = 20538513270.

The previous prime is 20538513257. The next prime is 20538513283. The reversal of 20538513271 is 17231583502.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20538513271 - 2⁹ = 20538512759 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20538513271.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20538513211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10269256635 + 10269256636.

It is an arithmetic number, because the mean of its divisors is an integer number (10269256636).

Almost surely, 2^20538513271 is an apocalyptic number.

20538513271 is a deficient number, since it is larger than the sum of its proper divisors (1).

20538513271 is an equidigital number, since it uses as much as digits as its factorization.

20538513271 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 50400, while the sum is 37.

It can be divided in two parts, 205 and 38513271, that added together give a triangular number (38513476 = T₈₇₇₆).

The spelling of 20538513271 in words is "twenty billion, five hundred thirty-eight million, five hundred thirteen thousand, two hundred seventy-one".