20543034503 has 4 divisors (see below), whose sum is σ = 20545323288. Its totient is φ = 20540745720.

The previous prime is 20543034493. The next prime is 20543034521. The reversal of 20543034503 is 30543034502.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 30543034502 = 2 ⋅15271517251.

It is a cyclic number.

It is not a de Polignac number, because 20543034503 - 2¹⁸ = 20542772359 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 (20543034553) 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, 1130876 + ... + 1148897.

It is an arithmetic number, because the mean of its divisors is an integer number (5136330822).

Almost surely, 2^20543034503 is an apocalyptic number.

20543034503 is a deficient number, since it is larger than the sum of its proper divisors (2288785).

20543034503 is an equidigital number, since it uses as much as digits as its factorization.

20543034503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2288784.

The product of its (nonzero) digits is 21600, while the sum is 29.

Subtracting 20543034503 from its reverse (30543034502), we obtain a palindrome (9999999999).

The spelling of 20543034503 in words is "twenty billion, five hundred forty-three million, thirty-four thousand, five hundred three".