19802819956 has 12 divisors (see below), whose sum is σ = 36161671392. Its totient is φ = 9470913848.

The previous prime is 19802819929. The next prime is 19802819957. The reversal of 19802819956 is 65991820891.

It is a self number, because there is not a number n which added to its sum of digits gives 19802819956.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19802819957) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 107623930 + ... + 107624113.

It is an arithmetic number, because the mean of its divisors is an integer number (3013472616).

Almost surely, 2^19802819956 is an apocalyptic number.

It is an amenable number.

19802819956 is a deficient number, since it is larger than the sum of its proper divisors (16358851436).

19802819956 is a wasteful number, since it uses less digits than its factorization.

19802819956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215248070 (or 215248068 counting only the distinct ones).

The product of its (nonzero) digits is 2799360, while the sum is 58.

The spelling of 19802819956 in words is "nineteen billion, eight hundred two million, eight hundred nineteen thousand, nine hundred fifty-six".