19804518552 has 384 divisors, whose sum is σ = 65325173760. Its totient is φ = 4949683200.

The previous prime is 19804518541. The next prime is 19804518553. The reversal of 19804518552 is 25581540891.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19804518553) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 53095038 + ... + 53095410.

It is an arithmetic number, because the mean of its divisors is an integer number (170117640).

Almost surely, 2^19804518552 is an apocalyptic number.

19804518552 is a gapful number since it is divisible by the number (12) 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 19804518552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32662586880).

19804518552 is an abundant number, since it is smaller than the sum of its proper divisors (45520655208).

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

19804518552 is a wasteful number, since it uses less digits than its factorization.

19804518552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 583 (or 572 counting only the distinct ones).

The product of its (nonzero) digits is 576000, while the sum is 48.

The spelling of 19804518552 in words is "nineteen billion, eight hundred four million, five hundred eighteen thousand, five hundred fifty-two".