20002543243 has 4 divisors (see below), whose sum is σ = 20042629000. Its totient is φ = 19962457488.

The previous prime is 20002543229. The next prime is 20002543273. The reversal of 20002543243 is 34234520002.

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 20002543243 - 2²⁵ = 19968988811 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20002543273) 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 3 ways as a sum of consecutive naturals, for example, 20042130 + ... + 20043127.

It is an arithmetic number, because the mean of its divisors is an integer number (5010657250).

Almost surely, 2^20002543243 is an apocalyptic number.

20002543243 is a deficient number, since it is larger than the sum of its proper divisors (40085757).

20002543243 is an equidigital number, since it uses as much as digits as its factorization.

20002543243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40085756.

The product of its (nonzero) digits is 5760, while the sum is 25.

The spelling of 20002543243 in words is "twenty billion, two million, five hundred forty-three thousand, two hundred forty-three".