19989945360 has 360 divisors, whose sum is σ = 84334810560. Its totient is φ = 4153628160.

The previous prime is 19989945359. The next prime is 19989945361. The reversal of 19989945360 is 6354998991.

19989945360 is a `hidden beast` number, since 1 + 9 + 9 + 8 + 9 + 94 + 536 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (19989945359) and next prime (19989945361).

It is a tau number, because it is divible by the number of its divisors (360).

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (19989945361) 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 71 ways as a sum of consecutive naturals, for example, 593451 + ... + 626229.

Almost surely, 2^19989945360 is an apocalyptic number.

19989945360 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 19989945360, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42167405280).

19989945360 is an abundant number, since it is smaller than the sum of its proper divisors (64344865200).

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

19989945360 is a wasteful number, since it uses less digits than its factorization.

19989945360 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32827 (or 32807 counting only the distinct ones).

The product of its (nonzero) digits is 18895680, while the sum is 63.

The spelling of 19989945360 in words is "nineteen billion, nine hundred eighty-nine million, nine hundred forty-five thousand, three hundred sixty".