20354206267663 has 4 divisors (see below), whose sum is σ = 21551512518720. Its totient is φ = 19156900016608.

The previous prime is 20354206267651. The next prime is 20354206267687. The reversal of 20354206267663 is 36676260245302.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20354206267663 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 20354206267663.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20354206267363) 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, 598653125503 + ... + 598653125536.

It is an arithmetic number, because the mean of its divisors is an integer number (5387878129680).

Almost surely, 2^{20354206267663} is an apocalyptic number.

20354206267663 is a deficient number, since it is larger than the sum of its proper divisors (1197306251057).

20354206267663 is a wasteful number, since it uses less digits than its factorization.

20354206267663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1197306251056.

The product of its (nonzero) digits is 13063680, while the sum is 52.

The spelling of 20354206267663 in words is "twenty trillion, three hundred fifty-four billion, two hundred six million, two hundred sixty-seven thousand, six hundred sixty-three".