19795246640 has 80 divisors (see below), whose sum is σ = 50376942336. Its totient is φ = 7189171200.

The previous prime is 19795246507. The next prime is 19795246649. The reversal of 19795246640 is 4664259791.

It is a tau number, because it is divible by the number of its divisors (80).

It is not an unprimeable number, because it can be changed into a prime (19795246649) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 92576 + ... + 219455.

Almost surely, 2^19795246640 is an apocalyptic number.

19795246640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19795246640 is an abundant number, since it is smaller than the sum of its proper divisors (30581695696).

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

19795246640 is a wasteful number, since it uses less digits than its factorization.

19795246640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 312118 (or 312112 counting only the distinct ones).

The product of its (nonzero) digits is 3265920, while the sum is 53.

The spelling of 19795246640 in words is "nineteen billion, seven hundred ninety-five million, two hundred forty-six thousand, six hundred forty".