20123131413 has 16 divisors (see below), whose sum is σ = 33451439616. Its totient is φ = 10453574640.

The previous prime is 20123131409. The next prime is 20123131423. The reversal of 20123131413 is 31413132102.

It is not a de Polignac number, because 20123131413 - 2² = 20123131409 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a self number, because there is not a number n which added to its sum of digits gives 20123131413.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20123131423) 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, 43556331 + ... + 43556792.

It is an arithmetic number, because the mean of its divisors is an integer number (2090714976).

Almost surely, 2^20123131413 is an apocalyptic number.

It is an amenable number.

20123131413 is a deficient number, since it is larger than the sum of its proper divisors (13328308203).

20123131413 is a wasteful number, since it uses less digits than its factorization.

20123131413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87113144.

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 20123131413 its reverse (31413132102), we get a palindrome (51536263515).

The spelling of 20123131413 in words is "twenty billion, one hundred twenty-three million, one hundred thirty-one thousand, four hundred thirteen".