19904361984 has 200 divisors, whose sum is σ = 63980957040. Its totient is φ = 6124253184.

The previous prime is 19904361949. The next prime is 19904362003. The reversal of 19904361984 is 48916340991.

It is a happy number.

19904361984 is a `hidden beast` number, since 19 + 9 + 0 + 4 + 3 + 619 + 8 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 19904361984.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 520677 + ... + 557595.

Almost surely, 2^19904361984 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19904361984, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31990478520).

19904361984 is an abundant number, since it is smaller than the sum of its proper divisors (44076595056).

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

19904361984 is an equidigital number, since it uses as much as digits as its factorization.

19904361984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36962 (or 36937 counting only the distinct ones).

The product of its (nonzero) digits is 1679616, while the sum is 54.

The spelling of 19904361984 in words is "nineteen billion, nine hundred four million, three hundred sixty-one thousand, nine hundred eighty-four".