19887705852 has 36 divisors (see below), whose sum is σ = 53980917480. Its totient is φ = 5682201504.

The previous prime is 19887705809. The next prime is 19887705863. The reversal of 19887705852 is 25850778891.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16910727 + ... + 16911902.

It is an arithmetic number, because the mean of its divisors is an integer number (1499469930).

Almost surely, 2^19887705852 is an apocalyptic number.

19887705852 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

19887705852 is an abundant number, since it is smaller than the sum of its proper divisors (34093211628).

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

19887705852 is a wasteful number, since it uses less digits than its factorization.

19887705852 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33822650 (or 33822641 counting only the distinct ones).

The product of its (nonzero) digits is 11289600, while the sum is 60.

The spelling of 19887705852 in words is "nineteen billion, eight hundred eighty-seven million, seven hundred five thousand, eight hundred fifty-two".