20311233100405 has 96 divisors (see below), whose sum is σ = 27598902432768. Its totient is φ = 14327107891200.

The previous prime is 20311233100397. The next prime is 20311233100453. The reversal of 20311233100405 is 50400133211302.

It is a happy number.

It is not a de Polignac number, because 20311233100405 - 2³ = 20311233100397 is a prime.

It is a super-2 number, since 2×20311233100405² (a number of 27 digits) contains 22 as substring.

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 20311233100405.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 776380525 + ... + 776406685.

It is an arithmetic number, because the mean of its divisors is an integer number (287488567008).

Almost surely, 2^{20311233100405} is an apocalyptic number.

It is an amenable number.

20311233100405 is a deficient number, since it is larger than the sum of its proper divisors (7287669332363).

20311233100405 is a wasteful number, since it uses less digits than its factorization.

20311233100405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26607 (or 26594 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 25.

Adding to 20311233100405 its reverse (50400133211302), we get a palindrome (70711366311707).

The spelling of 20311233100405 in words is "twenty trillion, three hundred eleven billion, two hundred thirty-three million, one hundred thousand, four hundred five".