20427424543 has 4 divisors (see below), whose sum is σ = 20464769560. Its totient is φ = 20390079528.

The previous prime is 20427424517. The next prime is 20427424573. The reversal of 20427424543 is 34542472402.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20427424543 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 (20427424573) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18671688 + ... + 18672781.

It is an arithmetic number, because the mean of its divisors is an integer number (5116192390).

Almost surely, 2^20427424543 is an apocalyptic number.

20427424543 is a deficient number, since it is larger than the sum of its proper divisors (37345017).

20427424543 is an equidigital number, since it uses as much as digits as its factorization.

20427424543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37345016.

The product of its (nonzero) digits is 215040, while the sum is 37.

Adding to 20427424543 its reverse (34542472402), we get a palindrome (54969896945).

The spelling of 20427424543 in words is "twenty billion, four hundred twenty-seven million, four hundred twenty-four thousand, five hundred forty-three".