19855443200 has 216 divisors, whose sum is σ = 50853411840. Its totient is φ = 7669555200.

The previous prime is 19855443193. The next prime is 19855443211. The reversal of 19855443200 is 234455891.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 45228581 + ... + 45229019.

Almost surely, 2^19855443200 is an apocalyptic number.

19855443200 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 19855443200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25426705920).

19855443200 is an abundant number, since it is smaller than the sum of its proper divisors (30997968640).

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

19855443200 is a wasteful number, since it uses less digits than its factorization.

19855443200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 693 (or 674 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 41.

The spelling of 19855443200 in words is "nineteen billion, eight hundred fifty-five million, four hundred forty-three thousand, two hundred".