20657848271 has 2 divisors, whose sum is σ = 20657848272. Its totient is φ = 20657848270.

The previous prime is 20657848243. The next prime is 20657848297. The reversal of 20657848271 is 17284875602.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20657848271 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20657848201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10328924135 + 10328924136.

It is an arithmetic number, because the mean of its divisors is an integer number (10328924136).

Almost surely, 2^20657848271 is an apocalyptic number.

20657848271 is a deficient number, since it is larger than the sum of its proper divisors (1).

20657848271 is an equidigital number, since it uses as much as digits as its factorization.

20657848271 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1505280, while the sum is 50.

The spelling of 20657848271 in words is "twenty billion, six hundred fifty-seven million, eight hundred forty-eight thousand, two hundred seventy-one".