20354324550523 has 4 divisors (see below), whose sum is σ = 21010915665088. Its totient is φ = 19697733435960.

The previous prime is 20354324550517. The next prime is 20354324550587. The reversal of 20354324550523 is 32505542345302.

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 20354324550523 - 2⁹ = 20354324550011 is a prime.

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 20354324550523.

It is not an unprimeable number, because it can be changed into a prime (20354324550503) 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, 328295557236 + ... + 328295557297.

It is an arithmetic number, because the mean of its divisors is an integer number (5252728916272).

Almost surely, 2^{20354324550523} is an apocalyptic number.

20354324550523 is a deficient number, since it is larger than the sum of its proper divisors (656591114565).

20354324550523 is an equidigital number, since it uses as much as digits as its factorization.

20354324550523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 656591114564.

The product of its (nonzero) digits is 2160000, while the sum is 43.

Adding to 20354324550523 its reverse (32505542345302), we get a palindrome (52859866895825).

The spelling of 20354324550523 in words is "twenty trillion, three hundred fifty-four billion, three hundred twenty-four million, five hundred fifty thousand, five hundred twenty-three".