19440097820 has 48 divisors (see below), whose sum is σ = 47961311328. Its totient is φ = 6525346560.

The previous prime is 19440097819. The next prime is 19440097823. The reversal of 19440097820 is 2879004491.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19440097823) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3395759 + ... + 3401478.

It is an arithmetic number, because the mean of its divisors is an integer number (999193986).

Almost surely, 2^19440097820 is an apocalyptic number.

19440097820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19440097820 is an abundant number, since it is smaller than the sum of its proper divisors (28521213508).

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

19440097820 is a wasteful number, since it uses less digits than its factorization.

19440097820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6797270 (or 6797268 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 44.

The spelling of 19440097820 in words is "nineteen billion, four hundred forty million, ninety-seven thousand, eight hundred twenty".