19718944 has 48 divisors (see below), whose sum is σ = 45335808. Its totient is φ = 8266752.

The previous prime is 19718911. The next prime is 19718947. The reversal of 19718944 is 44981791.

It is a self number, because there is not a number n which added to its sum of digits gives 19718944.

It is not an unprimeable number, because it can be changed into a prime (19718947) 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, 9592 + ... + 11464.

It is an arithmetic number, because the mean of its divisors is an integer number (944496).

Almost surely, 2^19718944 is an apocalyptic number.

19718944 is a gapful number since it is divisible by the number (14) 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 19718944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22667904).

19718944 is an abundant number, since it is smaller than the sum of its proper divisors (25616864).

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

19718944 is a wasteful number, since it uses less digits than its factorization.

19718944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1937 (or 1929 counting only the distinct ones).

The product of its digits is 72576, while the sum is 43.

The square root of 19718944 is about 4440.6017610229. The cubic root of 19718944 is about 270.1642530522.

The spelling of 19718944 in words is "nineteen million, seven hundred eighteen thousand, nine hundred forty-four".