20127170243543 has 4 divisors (see below), whose sum is σ = 21956912992968. Its totient is φ = 18297427494120.

The previous prime is 20127170243539. The next prime is 20127170243561. The reversal of 20127170243543 is 34534207172102.

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

It is a cyclic number.

It is not a de Polignac number, because 20127170243543 - 2² = 20127170243539 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20127170243543.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20127170243743) 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, 914871374696 + ... + 914871374717.

It is an arithmetic number, because the mean of its divisors is an integer number (5489228248242).

Almost surely, 2^{20127170243543} is an apocalyptic number.

20127170243543 is a deficient number, since it is larger than the sum of its proper divisors (1829742749425).

20127170243543 is a wasteful number, since it uses less digits than its factorization.

20127170243543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1829742749424.

The product of its (nonzero) digits is 282240, while the sum is 41.

The spelling of 20127170243543 in words is "twenty trillion, one hundred twenty-seven billion, one hundred seventy million, two hundred forty-three thousand, five hundred forty-three".