19471520236 has 72 divisors (see below), whose sum is σ = 41869234176. Its totient is φ = 7887831840.

The previous prime is 19471520227. The next prime is 19471520249. The reversal of 19471520236 is 63202517491.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 224005 + ... + 298531.

Almost surely, 2^19471520236 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 19471520236, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20934617088).

19471520236 is an abundant number, since it is smaller than the sum of its proper divisors (22397713940).

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

19471520236 is a wasteful number, since it uses less digits than its factorization.

19471520236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74619 (or 74610 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 40.

The spelling of 19471520236 in words is "nineteen billion, four hundred seventy-one million, five hundred twenty thousand, two hundred thirty-six".