19451901320 has 96 divisors (see below), whose sum is σ = 48161433600. Its totient is φ = 7050612096.

The previous prime is 19451901299. The next prime is 19451901323. The reversal of 19451901320 is 2310915491.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19451901323) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 377849 + ... + 426231.

It is an arithmetic number, because the mean of its divisors is an integer number (501681600).

Almost surely, 2^19451901320 is an apocalyptic number.

19451901320 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 19451901320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24080716800).

19451901320 is an abundant number, since it is smaller than the sum of its proper divisors (28709532280).

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

19451901320 is a wasteful number, since it uses less digits than its factorization.

19451901320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48459 (or 48432 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 35.

The spelling of 19451901320 in words is "nineteen billion, four hundred fifty-one million, nine hundred one thousand, three hundred twenty".