20808506882 has 4 divisors (see below), whose sum is σ = 31212760326. Its totient is φ = 10404253440.

The previous prime is 20808506881. The next prime is 20808506947. The reversal of 20808506882 is 28860580802.

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

It can be written as a sum of positive squares in only one way, i.e., 13426088641 + 7382418241 = 115871^2 + 85921^2 .

It is not an unprimeable number, because it can be changed into a prime (20808506881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5202126719 + ... + 5202126722.

Almost surely, 2^20808506882 is an apocalyptic number.

20808506882 is a deficient number, since it is larger than the sum of its proper divisors (10404253444).

20808506882 is a wasteful number, since it uses less digits than its factorization.

20808506882 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10404253443.

The product of its (nonzero) digits is 491520, while the sum is 47.

The spelling of 20808506882 in words is "twenty billion, eight hundred eight million, five hundred six thousand, eight hundred eighty-two".