19982647 has 4 divisors (see below), whose sum is σ = 20004696. Its totient is φ = 19960600.

The previous prime is 19982639. The next prime is 19982657. The reversal of 19982647 is 74628991.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 19982647 - 2³ = 19982639 is a prime.

It is a super-2 number, since 2×19982647² = 798612362253218, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 19982597 and 19982606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19982657) 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 3 ways as a sum of consecutive naturals, for example, 9604 + ... + 11497.

It is an arithmetic number, because the mean of its divisors is an integer number (5001174).

Almost surely, 2^19982647 is an apocalyptic number.

19982647 is a deficient number, since it is larger than the sum of its proper divisors (22049).

19982647 is an equidigital number, since it uses as much as digits as its factorization.

19982647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22048.

The product of its digits is 217728, while the sum is 46.

The square root of 19982647 is about 4470.1954095990. The cubic root of 19982647 is about 271.3632334619.

The spelling of 19982647 in words is "nineteen million, nine hundred eighty-two thousand, six hundred forty-seven".