19900065 has 16 divisors (see below), whose sum is σ = 31920768. Its totient is φ = 10586496.

The previous prime is 19900057. The next prime is 19900123. The reversal of 19900065 is 56000991.

It is not a de Polignac number, because 19900065 - 2³ = 19900057 is a prime.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 5404 + ... + 8306.

It is an arithmetic number, because the mean of its divisors is an integer number (1995048).

Almost surely, 2^19900065 is an apocalyptic number.

19900065 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

19900065 is a deficient number, since it is larger than the sum of its proper divisors (12020703).

19900065 is a wasteful number, since it uses less digits than its factorization.

19900065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3368.

The product of its (nonzero) digits is 2430, while the sum is 30.

The square root of 19900065 is about 4460.9488900905. The cubic root of 19900065 is about 270.9888976629.

The spelling of 19900065 in words is "nineteen million, nine hundred thousand, sixty-five".