19885455936 has 336 divisors, whose sum is σ = 62740641600. Its totient is φ = 6227269632.

The previous prime is 19885455923. The next prime is 19885455971. The reversal of 19885455936 is 63955458891.

19885455936 is a `hidden beast` number, since 1 + 9 + 8 + 8 + 545 + 59 + 36 = 666.

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, 51119230 + ... + 51119618.

It is an arithmetic number, because the mean of its divisors is an integer number (186728100).

Almost surely, 2^19885455936 is an apocalyptic number.

19885455936 is a gapful number since it is divisible by the number (16) 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 19885455936, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31370320800).

19885455936 is an abundant number, since it is smaller than the sum of its proper divisors (42855185664).

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

19885455936 is a wasteful number, since it uses less digits than its factorization.

19885455936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 608 (or 586 counting only the distinct ones).

The product of its digits is 46656000, while the sum is 63.

The spelling of 19885455936 in words is "nineteen billion, eight hundred eighty-five million, four hundred fifty-five thousand, nine hundred thirty-six".