20010312123 has 4 divisors (see below), whose sum is σ = 26680416168. Its totient is φ = 13340208080.

The previous prime is 20010312089. The next prime is 20010312149. The reversal of 20010312123 is 32121301002.

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 20010312123 - 2⁶ = 20010312059 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20018312123) 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, 3335052018 + ... + 3335052023.

It is an arithmetic number, because the mean of its divisors is an integer number (6670104042).

Almost surely, 2^20010312123 is an apocalyptic number.

20010312123 is a deficient number, since it is larger than the sum of its proper divisors (6670104045).

20010312123 is an equidigital number, since it uses as much as digits as its factorization.

20010312123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6670104044.

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 20010312123 its reverse (32121301002), we get a palindrome (52131613125).

It can be divided in two parts, 200103 and 12123, that added together give a triangular number (212226 = T₆₅₁).

The spelling of 20010312123 in words is "twenty billion, ten million, three hundred twelve thousand, one hundred twenty-three".