20171534243 has 32 divisors (see below), whose sum is σ = 25110958080. Its totient is φ = 15812496000.

The previous prime is 20171534231. The next prime is 20171534293. The reversal of 20171534243 is 34243517102.

It is not a de Polignac number, because 20171534243 - 2¹² = 20171530147 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20171534293) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1729973 + ... + 1741593.

It is an arithmetic number, because the mean of its divisors is an integer number (784717440).

Almost surely, 2^20171534243 is an apocalyptic number.

20171534243 is a deficient number, since it is larger than the sum of its proper divisors (4939423837).

20171534243 is a wasteful number, since it uses less digits than its factorization.

20171534243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12099.

The product of its (nonzero) digits is 20160, while the sum is 32.

The spelling of 20171534243 in words is "twenty billion, one hundred seventy-one million, five hundred thirty-four thousand, two hundred forty-three".