20123243405 has 16 divisors (see below), whose sum is σ = 25512088320. Its totient is φ = 15212753472.

The previous prime is 20123243377. The next prime is 20123243411. The reversal of 20123243405 is 50434232102.

It is a cyclic number.

It is not a de Polignac number, because 20123243405 - 2²⁶ = 20056134541 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1469579 + ... + 1483208.

It is an arithmetic number, because the mean of its divisors is an integer number (1594505520).

Almost surely, 2^20123243405 is an apocalyptic number.

It is an amenable number.

20123243405 is a deficient number, since it is larger than the sum of its proper divisors (5388844915).

20123243405 is a wasteful number, since it uses less digits than its factorization.

20123243405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2952868.

The product of its (nonzero) digits is 5760, while the sum is 26.

Adding to 20123243405 its reverse (50434232102), we get a palindrome (70557475507).

It can be divided in two parts, 20123243 and 405, that added together give a cube (20123648 = 272³).

The spelling of 20123243405 in words is "twenty billion, one hundred twenty-three million, two hundred forty-three thousand, four hundred five".