19905852512 has 288 divisors, whose sum is σ = 52284960000. Its totient is φ = 7373140992.

The previous prime is 19905852509. The next prime is 19905852521. The reversal of 19905852512 is 21525850991.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 39891239 + ... + 39891737.

It is an arithmetic number, because the mean of its divisors is an integer number (181545000).

Almost surely, 2^19905852512 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19905852512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26142480000).

19905852512 is an abundant number, since it is smaller than the sum of its proper divisors (32379107488).

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

19905852512 is a wasteful number, since it uses less digits than its factorization.

19905852512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 658 (or 643 counting only the distinct ones).

The product of its (nonzero) digits is 324000, while the sum is 47.

The spelling of 19905852512 in words is "nineteen billion, nine hundred five million, eight hundred fifty-two thousand, five hundred twelve".