20050005243 has 4 divisors (see below), whose sum is σ = 26733340328. Its totient is φ = 13366670160.

The previous prime is 20050005233. The next prime is 20050005259. The reversal of 20050005243 is 34250005002.

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

It is not a de Polignac number, because 20050005243 - 2²⁰ = 20048956667 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20050005233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3341667538 + ... + 3341667543.

It is an arithmetic number, because the mean of its divisors is an integer number (6683335082).

Almost surely, 2^20050005243 is an apocalyptic number.

20050005243 is a deficient number, since it is larger than the sum of its proper divisors (6683335085).

20050005243 is an equidigital number, since it uses as much as digits as its factorization.

20050005243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6683335084.

The product of its (nonzero) digits is 1200, while the sum is 21.

The spelling of 20050005243 in words is "twenty billion, fifty million, five thousand, two hundred forty-three".