20808686633 has 4 divisors (see below), whose sum is σ = 23781356160. Its totient is φ = 17836017108.

The previous prime is 20808686623. The next prime is 20808686641. The reversal of 20808686633 is 33668680802.

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 not a de Polignac number, because 20808686633 - 2¹² = 20808682537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20808686623) 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, 1486334753 + ... + 1486334766.

It is an arithmetic number, because the mean of its divisors is an integer number (5945339040).

Almost surely, 2^20808686633 is an apocalyptic number.

It is an amenable number.

20808686633 is a deficient number, since it is larger than the sum of its proper divisors (2972669527).

20808686633 is an equidigital number, since it uses as much as digits as its factorization.

20808686633 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2972669526.

The product of its (nonzero) digits is 1990656, while the sum is 50.

The spelling of 20808686633 in words is "twenty billion, eight hundred eight million, six hundred eighty-six thousand, six hundred thirty-three".