19716925440 has 96 divisors (see below), whose sum is σ = 63078855840. Its totient is φ = 5257838592.

The previous prime is 19716925439. The next prime is 19716925447. The reversal of 19716925440 is 4452961791.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 19716925440.

It is not an unprimeable number, because it can be changed into a prime (19716925447) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 290194 + ... + 351633.

It is an arithmetic number, because the mean of its divisors is an integer number (657071415).

Almost surely, 2^19716925440 is an apocalyptic number.

19716925440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19716925440 is an abundant number, since it is smaller than the sum of its proper divisors (43361930400).

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

19716925440 is an equidigital number, since it uses as much as digits as its factorization.

19716925440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 641857 (or 641837 counting only the distinct ones).

The product of its (nonzero) digits is 544320, while the sum is 48.

The spelling of 19716925440 in words is "nineteen billion, seven hundred sixteen million, nine hundred twenty-five thousand, four hundred forty".