20800331206663 has 4 divisors (see below), whose sum is σ = 21192790286088. Its totient is φ = 20407872127240.

The previous prime is 20800331206643. The next prime is 20800331206693. The reversal of 20800331206663 is 36660213300802.

It is a happy number.

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

It is a de Polignac number, because none of the positive numbers 2^k-20800331206663 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 (20800331206643) 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, 196229539633 + ... + 196229539738.

It is an arithmetic number, because the mean of its divisors is an integer number (5298197571522).

Almost surely, 2^{20800331206663} is an apocalyptic number.

20800331206663 is a deficient number, since it is larger than the sum of its proper divisors (392459079425).

20800331206663 is an equidigital number, since it uses as much as digits as its factorization.

20800331206663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 392459079424.

The product of its (nonzero) digits is 186624, while the sum is 40.

The spelling of 20800331206663 in words is "twenty trillion, eight hundred billion, three hundred thirty-one million, two hundred six thousand, six hundred sixty-three".