19830645 has 12 divisors (see below), whose sum is σ = 34373196. Its totient is φ = 10576320.

The previous prime is 19830637. The next prime is 19830677. The reversal of 19830645 is 54603891.

19830645 is a `hidden beast` number, since 1 + 9 + 8 + 3 + 0 + 645 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 13793796 + 6036849 = 3714^2 + 2457^2 .

It is not a de Polignac number, because 19830645 - 2³ = 19830637 is a prime.

It is a super-2 number, since 2×19830645² = 786508962232050, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 220296 + ... + 220385.

It is an arithmetic number, because the mean of its divisors is an integer number (2864433).

Almost surely, 2^19830645 is an apocalyptic number.

19830645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

19830645 is a deficient number, since it is larger than the sum of its proper divisors (14542551).

19830645 is a wasteful number, since it uses less digits than its factorization.

19830645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 440692 (or 440689 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 19830645 is about 4453.1612366947. The cubic root of 19830645 is about 270.6734218657.

The spelling of 19830645 in words is "nineteen million, eight hundred thirty thousand, six hundred forty-five".