20531203543 has 4 divisors (see below), whose sum is σ = 20734482888. Its totient is φ = 20327924200.

The previous prime is 20531203513. The next prime is 20531203591. The reversal of 20531203543 is 34530213502.

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 20531203543 - 2²⁵ = 20497649111 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 (20531203513) 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, 101639521 + ... + 101639722.

It is an arithmetic number, because the mean of its divisors is an integer number (5183620722).

Almost surely, 2^20531203543 is an apocalyptic number.

20531203543 is a deficient number, since it is larger than the sum of its proper divisors (203279345).

20531203543 is a wasteful number, since it uses less digits than its factorization.

20531203543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203279344.

The product of its (nonzero) digits is 10800, while the sum is 28.

The spelling of 20531203543 in words is "twenty billion, five hundred thirty-one million, two hundred three thousand, five hundred forty-three".