19966716 has 144 divisors (see below), whose sum is σ = 65882880. Its totient is φ = 5186160.

The previous prime is 19966711. The next prime is 19966747. The reversal of 19966716 is 61766991.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19966711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1815151 + ... + 1815161.

It is an arithmetic number, because the mean of its divisors is an integer number (457520).

Almost surely, 2^19966716 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19966716, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32941440).

19966716 is an abundant number, since it is smaller than the sum of its proper divisors (45916164).

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

19966716 is an equidigital number, since it uses as much as digits as its factorization.

19966716 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59 (or 23 counting only the distinct ones).

The product of its digits is 122472, while the sum is 45.

The square root of 19966716 is about 4468.4131411498. The cubic root of 19966716 is about 271.2911002584.

The spelling of 19966716 in words is "nineteen million, nine hundred sixty-six thousand, seven hundred sixteen".