19686713 has 8 divisors (see below), whose sum is σ = 20288136. Its totient is φ = 19094400.

The previous prime is 19686673. The next prime is 19686727. The reversal of 19686713 is 31768691.

It can be written as a sum of positive squares in 4 ways, for example, as 1776889 + 17909824 = 1333^2 + 4232^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 19686713 - 2⁶ = 19686649 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (19686743) 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, 2243 + ... + 6663.

It is an arithmetic number, because the mean of its divisors is an integer number (2536017).

Almost surely, 2^19686713 is an apocalyptic number.

It is an amenable number.

19686713 is a deficient number, since it is larger than the sum of its proper divisors (601423).

19686713 is an equidigital number, since it uses as much as digits as its factorization.

19686713 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4555.

The product of its digits is 54432, while the sum is 41.

The square root of 19686713 is about 4436.9711515853. The cubic root of 19686713 is about 270.0169765274.

The spelling of 19686713 in words is "nineteen million, six hundred eighty-six thousand, seven hundred thirteen".