20128723949003 has 4 divisors (see below), whose sum is σ = 20128767049368. Its totient is φ = 20128680848640.

The previous prime is 20128723948967. The next prime is 20128723949023. The reversal of 20128723949003 is 30094932782102.

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 20128723949003 - 2⁶ = 20128723948939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20128723949023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20841893 + ... + 21786278.

It is an arithmetic number, because the mean of its divisors is an integer number (5032191762342).

Almost surely, 2^{20128723949003} is an apocalyptic number.

20128723949003 is a deficient number, since it is larger than the sum of its proper divisors (43100365).

20128723949003 is an equidigital number, since it uses as much as digits as its factorization.

20128723949003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43100364.

The product of its (nonzero) digits is 1306368, while the sum is 50.

The spelling of 20128723949003 in words is "twenty trillion, one hundred twenty-eight billion, seven hundred twenty-three million, nine hundred forty-nine thousand, three".