20123131023313 has 4 divisors (see below), whose sum is σ = 20502812740788. Its totient is φ = 19743449305840.

The previous prime is 20123131023311. The next prime is 20123131023371. The reversal of 20123131023313 is 31332013132102.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 17910602696464 + 2212528326849 = 4232092^2 + 1487457^2 .

It is a cyclic number.

It is not a de Polignac number, because 20123131023313 - 2¹ = 20123131023311 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20123131023311) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 189840858658 + ... + 189840858763.

It is an arithmetic number, because the mean of its divisors is an integer number (5125703185197).

Almost surely, 2^{20123131023313} is an apocalyptic number.

It is an amenable number.

20123131023313 is a deficient number, since it is larger than the sum of its proper divisors (379681717475).

20123131023313 is an equidigital number, since it uses as much as digits as its factorization.

20123131023313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 379681717474.

The product of its (nonzero) digits is 1944, while the sum is 25.

Adding to 20123131023313 its reverse (31332013132102), we get a palindrome (51455144155415).

The spelling of 20123131023313 in words is "twenty trillion, one hundred twenty-three billion, one hundred thirty-one million, twenty-three thousand, three hundred thirteen".