20876841571 has 4 divisors (see below), whose sum is σ = 20879235432. Its totient is φ = 20874447712.

The previous prime is 20876841553. The next prime is 20876841647. The reversal of 20876841571 is 17514867802.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20876841571 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20876841511) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1183801 + ... + 1201306.

It is an arithmetic number, because the mean of its divisors is an integer number (5219808858).

Almost surely, 2^20876841571 is an apocalyptic number.

20876841571 is a deficient number, since it is larger than the sum of its proper divisors (2393861).

20876841571 is an equidigital number, since it uses as much as digits as its factorization.

20876841571 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2393860.

The product of its (nonzero) digits is 752640, while the sum is 49.

The spelling of 20876841571 in words is "twenty billion, eight hundred seventy-six million, eight hundred forty-one thousand, five hundred seventy-one".