19795960640 has 56 divisors (see below), whose sum is σ = 47206159080. Its totient is φ = 7907125248.

The previous prime is 19795960589. The next prime is 19795960703. The reversal of 19795960640 is 4606959791.

It can be written as a sum of positive squares in 4 ways, for example, as 101767744 + 19694192896 = 10088^2 + 140336^2 .

It is a congruent 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 7 ways as a sum of consecutive naturals, for example, 183254 + ... + 270506.

Almost surely, 2^19795960640 is an apocalyptic number.

19795960640 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 19795960640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23603079540).

19795960640 is an abundant number, since it is smaller than the sum of its proper divisors (27410198440).

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

19795960640 is an equidigital number, since it uses as much as digits as its factorization.

19795960640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87979 (or 87969 counting only the distinct ones).

The product of its (nonzero) digits is 3674160, while the sum is 56.

The spelling of 19795960640 in words is "nineteen billion, seven hundred ninety-five million, nine hundred sixty thousand, six hundred forty".