20113312123 has 8 divisors (see below), whose sum is σ = 20822136480. Its totient is φ = 19405505280.

The previous prime is 20113312111. The next prime is 20113312217. The reversal of 20113312123 is 32121331102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20113312123 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 20113312123.

It is not an unprimeable number, because it can be changed into a prime (20113312103) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 214038 + ... + 293323.

It is an arithmetic number, because the mean of its divisors is an integer number (2602767060).

Almost surely, 2^20113312123 is an apocalyptic number.

20113312123 is a deficient number, since it is larger than the sum of its proper divisors (708824357).

20113312123 is a wasteful number, since it uses less digits than its factorization.

20113312123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 508757.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 20113312123 its reverse (32121331102), we get a palindrome (52234643225).

The spelling of 20113312123 in words is "twenty billion, one hundred thirteen million, three hundred twelve thousand, one hundred twenty-three".