20533544243 has 4 divisors (see below), whose sum is σ = 20587722840. Its totient is φ = 20479365648.

The previous prime is 20533544237. The next prime is 20533544257. The reversal of 20533544243 is 34244533502.

It is a happy number.

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 20533544243 - 2³² = 16238576947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20533544293) 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, 27088730 + ... + 27089487.

It is an arithmetic number, because the mean of its divisors is an integer number (5146930710).

Almost surely, 2^20533544243 is an apocalyptic number.

20533544243 is a deficient number, since it is larger than the sum of its proper divisors (54178597).

20533544243 is an equidigital number, since it uses as much as digits as its factorization.

20533544243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54178596.

The product of its (nonzero) digits is 172800, while the sum is 35.

The spelling of 20533544243 in words is "twenty billion, five hundred thirty-three million, five hundred forty-four thousand, two hundred forty-three".