19982945 has 4 divisors (see below), whose sum is σ = 23979540. Its totient is φ = 15986352.

The previous prime is 19982933. The next prime is 19982953. The reversal of 19982945 is 54928991.

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 11262736 + 8720209 = 3356^2 + 2953^2 .

It is a cyclic number.

It is not a de Polignac number, because 19982945 - 2⁶ = 19982881 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19982945.

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 3 ways as a sum of consecutive naturals, for example, 1998290 + ... + 1998299.

It is an arithmetic number, because the mean of its divisors is an integer number (5994885).

Almost surely, 2^19982945 is an apocalyptic number.

It is an amenable number.

19982945 is a deficient number, since it is larger than the sum of its proper divisors (3996595).

19982945 is an equidigital number, since it uses as much as digits as its factorization.

19982945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3996594.

The product of its digits is 233280, while the sum is 47.

The square root of 19982945 is about 4470.2287413509. The cubic root of 19982945 is about 271.3645823964.

The spelling of 19982945 in words is "nineteen million, nine hundred eighty-two thousand, nine hundred forty-five".