20312641135523 has 4 divisors (see below), whose sum is σ = 22159244875128. Its totient is φ = 18466037395920.

The previous prime is 20312641135489. The next prime is 20312641135541. The reversal of 20312641135523 is 32553114621302.

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

It is a cyclic number.

It is not a de Polignac number, because 20312641135523 - 2¹⁴ = 20312641119139 is a prime.

It is a super-2 number, since 2×20312641135523² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20312641135823) 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, 923301869786 + ... + 923301869807.

It is an arithmetic number, because the mean of its divisors is an integer number (5539811218782).

Almost surely, 2^{20312641135523} is an apocalyptic number.

20312641135523 is a deficient number, since it is larger than the sum of its proper divisors (1846603739605).

20312641135523 is a wasteful number, since it uses less digits than its factorization.

20312641135523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1846603739604.

The product of its (nonzero) digits is 129600, while the sum is 38.

Adding to 20312641135523 its reverse (32553114621302), we get a palindrome (52865755756825).

The spelling of 20312641135523 in words is "twenty trillion, three hundred twelve billion, six hundred forty-one million, one hundred thirty-five thousand, five hundred twenty-three".