19361989920 has 768 divisors, whose sum is σ = 78900756480. Its totient is φ = 3881779200.

The previous prime is 19361989903. The next prime is 19361989943. The reversal of 19361989920 is 2998916391.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 106972230 + ... + 106972410.

It is an arithmetic number, because the mean of its divisors is an integer number (102735360).

Almost surely, 2^19361989920 is an apocalyptic number.

19361989920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19361989920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39450378240).

19361989920 is an abundant number, since it is smaller than the sum of its proper divisors (59538766560).

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

19361989920 is a wasteful number, since it uses less digits than its factorization.

19361989920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 329 (or 321 counting only the distinct ones).

The product of its (nonzero) digits is 1889568, while the sum is 57.

The spelling of 19361989920 in words is "nineteen billion, three hundred sixty-one million, nine hundred eighty-nine thousand, nine hundred twenty".