19716424 has 96 divisors (see below), whose sum is σ = 47832120. Its totient is φ = 7547904.

The previous prime is 19716421. The next prime is 19716427. The reversal of 19716424 is 42461791.

It is an interprime number because it is at equal distance from previous prime (19716421) and next prime (19716427).

It can be written as a sum of positive squares in 4 ways, for example, as 16144324 + 3572100 = 4018^2 + 1890^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 19716424.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19716421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 270052 + ... + 270124.

Almost surely, 2^19716424 is an apocalyptic number.

19716424 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 19716424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23916060).

19716424 is an abundant number, since it is smaller than the sum of its proper divisors (28115696).

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

19716424 is a wasteful number, since it uses less digits than its factorization.

19716424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159 (or 148 counting only the distinct ones).

The product of its digits is 12096, while the sum is 34.

The square root of 19716424 is about 4440.3180066297. The cubic root of 19716424 is about 270.1527439349.

The spelling of 19716424 in words is "nineteen million, seven hundred sixteen thousand, four hundred twenty-four".