19905950658984 has 64 divisors (see below), whose sum is σ = 55923072105600. Its totient is φ = 5858607549696.

The previous prime is 19905950658929. The next prime is 19905950659009. The reversal of 19905950658984 is 48985605950991.

It is a Harshad number since it is a multiple of its sum of digits (78).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1386973779 + ... + 1386988130.

It is an arithmetic number, because the mean of its divisors is an integer number (873798001650).

Almost surely, 2^{19905950658984} is an apocalyptic number.

It is an amenable number.

19905950658984 is an abundant number, since it is smaller than the sum of its proper divisors (36017121446616).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19905950658984 is a wasteful number, since it uses less digits than its factorization.

19905950658984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2773961954 (or 2773961950 counting only the distinct ones).

The product of its (nonzero) digits is 1259712000, while the sum is 78.

The spelling of 19905950658984 in words is "nineteen trillion, nine hundred five billion, nine hundred fifty million, six hundred fifty-eight thousand, nine hundred eighty-four".