19718244 has 108 divisors (see below), whose sum is σ = 61815936. Its totient is φ = 5189184.

The previous prime is 19718221. The next prime is 19718261. The reversal of 19718244 is 44281791.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 19718199 and 19718208.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 42357 + ... + 42819.

Almost surely, 2^19718244 is an apocalyptic number.

19718244 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 19718244, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30907968).

19718244 is an abundant number, since it is smaller than the sum of its proper divisors (42097692).

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

19718244 is a wasteful number, since it uses less digits than its factorization.

19718244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 506 (or 488 counting only the distinct ones).

The product of its digits is 16128, while the sum is 36.

The square root of 19718244 is about 4440.5229421770. The cubic root of 19718244 is about 270.1610561736.

The spelling of 19718244 in words is "nineteen million, seven hundred eighteen thousand, two hundred forty-four".