19503502056 has 80 divisors (see below), whose sum is σ = 54672156000. Its totient is φ = 6495896736.

The previous prime is 19503502013. The next prime is 19503502069. The reversal of 19503502056 is 65020530591.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 19503502056.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 832795 + ... + 855893.

It is an arithmetic number, because the mean of its divisors is an integer number (683401950).

Almost surely, 2^19503502056 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 19503502056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27336078000).

19503502056 is an abundant number, since it is smaller than the sum of its proper divisors (35168653944).

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

19503502056 is a wasteful number, since it uses less digits than its factorization.

19503502056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24420 (or 24407 counting only the distinct ones).

The product of its (nonzero) digits is 40500, while the sum is 36.

The spelling of 19503502056 in words is "nineteen billion, five hundred three million, five hundred two thousand, fifty-six".