20123112405 has 16 divisors (see below), whose sum is σ = 35123978304. Its totient is φ = 9756660480.

The previous prime is 20123112389. The next prime is 20123112409. The reversal of 20123112405 is 50421132102.

It is not a de Polignac number, because 20123112405 - 2⁴ = 20123112389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20123112409) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 60978964 + ... + 60979293.

It is an arithmetic number, because the mean of its divisors is an integer number (2195248644).

Almost surely, 2^20123112405 is an apocalyptic number.

It is an amenable number.

20123112405 is a deficient number, since it is larger than the sum of its proper divisors (15000865899).

20123112405 is a wasteful number, since it uses less digits than its factorization.

20123112405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121958276.

The product of its (nonzero) digits is 480, while the sum is 21.

Adding to 20123112405 its reverse (50421132102), we get a palindrome (70544244507).

The spelling of 20123112405 in words is "twenty billion, one hundred twenty-three million, one hundred twelve thousand, four hundred five".