20191716 has 36 divisors (see below), whose sum is σ = 54044172. Its totient is φ = 6334464.

The previous prime is 20191709. The next prime is 20191729. The reversal of 20191716 is 61719102.

It can be written as a sum of positive squares in 2 ways, for example, as 7617600 + 12574116 = 2760^2 + 3546^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a self number, because there is not a number n which added to its sum of digits gives 20191716.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 15885 + ... + 17108.

It is an arithmetic number, because the mean of its divisors is an integer number (1501227).

Almost surely, 2^20191716 is an apocalyptic number.

It is an amenable number.

20191716 is an abundant number, since it is smaller than the sum of its proper divisors (33852456).

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

20191716 is a wasteful number, since it uses less digits than its factorization.

20191716 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33020 (or 33015 counting only the distinct ones).

The product of its (nonzero) digits is 756, while the sum is 27.

The square root of 20191716 is about 4493.5193334401. The cubic root of 20191716 is about 272.3063337906.

The spelling of 20191716 in words is "twenty million, one hundred ninety-one thousand, seven hundred sixteen".