20045332543 has 4 divisors (see below), whose sum is σ = 20116668528. Its totient is φ = 19973996560.

The previous prime is 20045332511. The next prime is 20045332603. The reversal of 20045332543 is 34523354002.

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 20045332543 - 2⁵ = 20045332511 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20045332243) 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, 35667571 + ... + 35668132.

It is an arithmetic number, because the mean of its divisors is an integer number (5029167132).

Almost surely, 2^20045332543 is an apocalyptic number.

20045332543 is a deficient number, since it is larger than the sum of its proper divisors (71335985).

20045332543 is an equidigital number, since it uses as much as digits as its factorization.

20045332543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71335984.

The product of its (nonzero) digits is 43200, while the sum is 31.

Adding to 20045332543 its reverse (34523354002), we get a palindrome (54568686545).

The spelling of 20045332543 in words is "twenty billion, forty-five million, three hundred thirty-two thousand, five hundred forty-three".