20424431543 has 4 divisors (see below), whose sum is σ = 20549734968. Its totient is φ = 20299128120.

The previous prime is 20424431537. The next prime is 20424431563. The reversal of 20424431543 is 34513442402.

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 20424431543 - 2⁴ = 20424431527 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 (20424431563) 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, 62651468 + ... + 62651793.

It is an arithmetic number, because the mean of its divisors is an integer number (5137433742).

Almost surely, 2^20424431543 is an apocalyptic number.

20424431543 is a deficient number, since it is larger than the sum of its proper divisors (125303425).

20424431543 is a wasteful number, since it uses less digits than its factorization.

20424431543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125303424.

The product of its (nonzero) digits is 46080, while the sum is 32.

Adding to 20424431543 its reverse (34513442402), we get a palindrome (54937873945).

The spelling of 20424431543 in words is "twenty billion, four hundred twenty-four million, four hundred thirty-one thousand, five hundred forty-three".