19987105104 has 50 divisors (see below), whose sum is σ = 57848484650. Its totient is φ = 6662367936.

The previous prime is 19987105091. The next prime is 19987105163. The reversal of 19987105104 is 40150178991.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 18176432400 + 1810672704 = 134820^2 + 42552^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 19987105104.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 7709779 + ... + 7712370.

It is an arithmetic number, because the mean of its divisors is an integer number (1156969693).

Almost surely, 2^19987105104 is an apocalyptic number.

It is an amenable number.

19987105104 is an abundant number, since it is smaller than the sum of its proper divisors (37861379546).

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

19987105104 is a wasteful number, since it uses less digits than its factorization.

19987105104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15422169 (or 15422154 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 45.

The spelling of 19987105104 in words is "nineteen billion, nine hundred eighty-seven million, one hundred five thousand, one hundred four".