19995965 has 8 divisors (see below), whose sum is σ = 26176608. Its totient is φ = 14542480.

The previous prime is 19995959. The next prime is 19995967. The reversal of 19995965 is 56959991.

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

It is not a de Polignac number, because 19995965 - 2¹⁴ = 19979581 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19995967) 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 7 ways as a sum of consecutive naturals, for example, 181727 + ... + 181836.

It is an arithmetic number, because the mean of its divisors is an integer number (3272076).

Almost surely, 2^19995965 is an apocalyptic number.

It is an amenable number.

19995965 is a deficient number, since it is larger than the sum of its proper divisors (6180643).

19995965 is a wasteful number, since it uses less digits than its factorization.

19995965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 363579.

The product of its digits is 984150, while the sum is 53.

The square root of 19995965 is about 4471.6848055291. The cubic root of 19995965 is about 271.4235059733.

The spelling of 19995965 in words is "nineteen million, nine hundred ninety-five thousand, nine hundred sixty-five".