19881054720 has 640 divisors, whose sum is σ = 73927054080. Its totient is φ = 5123948544.

The previous prime is 19881054703. The next prime is 19881054763. The reversal of 19881054720 is 2745018891.

19881054720 is a `hidden beast` number, since 1 + 9 + 8 + 81 + 0 + 547 + 20 = 666.

It is a tau number, because it is divible by the number of its divisors (640).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 296732127 + ... + 296732193.

It is an arithmetic number, because the mean of its divisors is an integer number (115511022).

Almost surely, 2^19881054720 is an apocalyptic number.

19881054720 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 19881054720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36963527040).

19881054720 is an abundant number, since it is smaller than the sum of its proper divisors (54045999360).

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

19881054720 is an frugal number, since it uses more digits than its factorization.

19881054720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164 (or 130 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 45.

The spelling of 19881054720 in words is "nineteen billion, eight hundred eighty-one million, fifty-four thousand, seven hundred twenty".