19800065 has 8 divisors (see below), whose sum is σ = 24046848. Its totient is φ = 15648880.

The previous prime is 19799993. The next prime is 19800083. The reversal of 19800065 is 56000891.

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

It is not a de Polignac number, because 19800065 - 2¹⁰ = 19799041 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23441 + ... + 24270.

It is an arithmetic number, because the mean of its divisors is an integer number (3005856).

It is a Proth number, since it is equal to 2417 ⋅ 2¹³ + 1 and 2417 < 2¹³.

Almost surely, 2^19800065 is an apocalyptic number.

It is an amenable number.

19800065 is a deficient number, since it is larger than the sum of its proper divisors (4246783).

19800065 is an equidigital number, since it uses as much as digits as its factorization.

19800065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47799.

The product of its (nonzero) digits is 2160, while the sum is 29.

The square root of 19800065 is about 4449.7263960832. The cubic root of 19800065 is about 270.5342189380.

The spelling of 19800065 in words is "nineteen million, eight hundred thousand, sixty-five".