20344145256571 has 2 divisors, whose sum is σ = 20344145256572. Its totient is φ = 20344145256570.

The previous prime is 20344145256473. The next prime is 20344145256587. The reversal of 20344145256571 is 17565254144302.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20344145256571 - 2¹⁵ = 20344145223803 is a prime.

It is not a weakly prime, because it can be changed into another prime (20344145256371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10172072628285 + 10172072628286.

It is an arithmetic number, because the mean of its divisors is an integer number (10172072628286).

Almost surely, 2^{20344145256571} is an apocalyptic number.

20344145256571 is a deficient number, since it is larger than the sum of its proper divisors (1).

20344145256571 is an equidigital number, since it uses as much as digits as its factorization.

20344145256571 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032000, while the sum is 49.

The spelling of 20344145256571 in words is "twenty trillion, three hundred forty-four billion, one hundred forty-five million, two hundred fifty-six thousand, five hundred seventy-one".