19982705 has 4 divisors (see below), whose sum is σ = 23979252. Its totient is φ = 15986160.

The previous prime is 19982687. The next prime is 19982707. The reversal of 19982705 is 50728991.

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

It can be written as a sum of positive squares in 2 ways, for example, as 4293184 + 15689521 = 2072^2 + 3961^2 .

It is not a de Polignac number, because 19982705 - 2⁸ = 19982449 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 (19982707) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1998266 + ... + 1998275.

It is an arithmetic number, because the mean of its divisors is an integer number (5994813).

Almost surely, 2^19982705 is an apocalyptic number.

It is an amenable number.

19982705 is a deficient number, since it is larger than the sum of its proper divisors (3996547).

19982705 is an equidigital number, since it uses as much as digits as its factorization.

19982705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3996546.

The product of its (nonzero) digits is 45360, while the sum is 41.

The square root of 19982705 is about 4470.2018970064. The cubic root of 19982705 is about 271.3634960073.

The spelling of 19982705 in words is "nineteen million, nine hundred eighty-two thousand, seven hundred five".