20123031113213 has 4 divisors (see below), whose sum is σ = 22997749843680. Its totient is φ = 17248312382748.

The previous prime is 20123031113177. The next prime is 20123031113239. The reversal of 20123031113213 is 31231113032102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20123031113213 - 2²² = 20123026918909 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20123031113413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1437359365223 + ... + 1437359365236.

It is an arithmetic number, because the mean of its divisors is an integer number (5749437460920).

Almost surely, 2^{20123031113213} is an apocalyptic number.

It is an amenable number.

20123031113213 is a deficient number, since it is larger than the sum of its proper divisors (2874718730467).

20123031113213 is an equidigital number, since it uses as much as digits as its factorization.

20123031113213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2874718730466.

The product of its (nonzero) digits is 648, while the sum is 23.

Adding to 20123031113213 its reverse (31231113032102), we get a palindrome (51354144145315).

The spelling of 20123031113213 in words is "twenty trillion, one hundred twenty-three billion, thirty-one million, one hundred thirteen thousand, two hundred thirteen".