19887477120 has 576 divisors, whose sum is σ = 82499264640. Its totient is φ = 4397137920.

The previous prime is 19887477119. The next prime is 19887477131. The reversal of 19887477120 is 2177478891.

19887477120 is a `hidden beast` number, since 1 + 98 + 87 + 477 + 1 + 2 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (576).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 8748304 + ... + 8750576.

It is an arithmetic number, because the mean of its divisors is an integer number (143227890).

Almost surely, 2^19887477120 is an apocalyptic number.

19887477120 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 19887477120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41249632320).

19887477120 is an abundant number, since it is smaller than the sum of its proper divisors (62611787520).

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

19887477120 is a wasteful number, since it uses less digits than its factorization.

19887477120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2343 (or 2321 counting only the distinct ones).

The product of its (nonzero) digits is 1580544, while the sum is 54.

The spelling of 19887477120 in words is "nineteen billion, eight hundred eighty-seven million, four hundred seventy-seven thousand, one hundred twenty".