20543161403 has 4 divisors (see below), whose sum is σ = 21751582680. Its totient is φ = 19334740128.

The previous prime is 20543161391. The next prime is 20543161409. The reversal of 20543161403 is 30416134502.

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 20543161403 - 2³⁰ = 19469419579 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20543161409) 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, 604210613 + ... + 604210646.

It is an arithmetic number, because the mean of its divisors is an integer number (5437895670).

Almost surely, 2^20543161403 is an apocalyptic number.

20543161403 is a deficient number, since it is larger than the sum of its proper divisors (1208421277).

20543161403 is a wasteful number, since it uses less digits than its factorization.

20543161403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1208421276.

The product of its (nonzero) digits is 8640, while the sum is 29.

Adding to 20543161403 its reverse (30416134502), we get a palindrome (50959295905).

The spelling of 20543161403 in words is "twenty billion, five hundred forty-three million, one hundred sixty-one thousand, four hundred three".