19939981682 has 32 divisors (see below), whose sum is σ = 30755214000. Its totient is φ = 9692863488.

The previous prime is 19939981679. The next prime is 19939981693. The reversal of 19939981682 is 28618993991.

It is a Cunningham number, because it is equal to 141209²+1.

It can be written as a sum of positive squares in 8 ways, for example, as 9562688521 + 10377293161 = 97789^2 + 101869^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4532708 + ... + 4537104.

Almost surely, 2^19939981682 is an apocalyptic number.

19939981682 is a deficient number, since it is larger than the sum of its proper divisors (10815232318).

19939981682 is a wasteful number, since it uses less digits than its factorization.

19939981682 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4910.

The product of its digits is 15116544, while the sum is 65.

The spelling of 19939981682 in words is "nineteen billion, nine hundred thirty-nine million, nine hundred eighty-one thousand, six hundred eighty-two".