19941438720 has 144 divisors (see below), whose sum is σ = 72786349440. Its totient is φ = 4558036992.

The previous prime is 19941438677. The next prime is 19941438731. The reversal of 19941438720 is 2783414991.

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 19941438720.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 344055 + ... + 397814.

It is an arithmetic number, because the mean of its divisors is an integer number (505460760).

Almost surely, 2^19941438720 is an apocalyptic number.

19941438720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19941438720 is an abundant number, since it is smaller than the sum of its proper divisors (52844910720).

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

19941438720 is an equidigital number, since it uses as much as digits as its factorization.

19941438720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 741900 (or 741886 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 48.

The spelling of 19941438720 in words is "nineteen billion, nine hundred forty-one million, four hundred thirty-eight thousand, seven hundred twenty".