20123543003 has 4 divisors (see below), whose sum is σ = 20126340888. Its totient is φ = 20120745120.

The previous prime is 20123542931. The next prime is 20123543021. The reversal of 20123543003 is 30034532102.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 30034532102 = 2 ⋅15017266051.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20123543003 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20123543003.

It is not an unprimeable number, because it can be changed into a prime (20123563003) 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, 1388126 + ... + 1402547.

It is an arithmetic number, because the mean of its divisors is an integer number (5031585222).

Almost surely, 2^20123543003 is an apocalyptic number.

20123543003 is a deficient number, since it is larger than the sum of its proper divisors (2797885).

20123543003 is an equidigital number, since it uses as much as digits as its factorization.

20123543003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2797884.

The product of its (nonzero) digits is 2160, while the sum is 23.

The spelling of 20123543003 in words is "twenty billion, one hundred twenty-three million, five hundred forty-three thousand, three".