19261220320 has 96 divisors (see below), whose sum is σ = 48384604800. Its totient is φ = 7220699136.

The previous prime is 19261220311. The next prime is 19261220323. The reversal of 19261220320 is 2302216291.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19261220323) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 635266 + ... + 664894.

It is an arithmetic number, because the mean of its divisors is an integer number (504006300).

Almost surely, 2^19261220320 is an apocalyptic number.

19261220320 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 19261220320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24192302400).

19261220320 is an abundant number, since it is smaller than the sum of its proper divisors (29123384480).

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

19261220320 is a wasteful number, since it uses less digits than its factorization.

19261220320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29900 (or 29892 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 28.

The spelling of 19261220320 in words is "nineteen billion, two hundred sixty-one million, two hundred twenty thousand, three hundred twenty".