20003450543 has 4 divisors (see below), whose sum is σ = 20873165808. Its totient is φ = 19133735280.

The previous prime is 20003450539. The next prime is 20003450549. The reversal of 20003450543 is 34505430002.

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 20003450543 - 2² = 20003450539 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 (20003450549) 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, 434857598 + ... + 434857643.

It is an arithmetic number, because the mean of its divisors is an integer number (5218291452).

Almost surely, 2^20003450543 is an apocalyptic number.

20003450543 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

20003450543 is a deficient number, since it is larger than the sum of its proper divisors (869715265).

20003450543 is an equidigital number, since it uses as much as digits as its factorization.

20003450543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 869715264.

The product of its (nonzero) digits is 7200, while the sum is 26.

Adding to 20003450543 its reverse (34505430002), we get a palindrome (54508880545).

It can be divided in two parts, 2000 and 3450543, that added together give a palindrome (3452543).

The spelling of 20003450543 in words is "twenty billion, three million, four hundred fifty thousand, five hundred forty-three".