19996065 has 40 divisors (see below), whose sum is σ = 36285480. Its totient is φ = 10533888.

The previous prime is 19996061. The next prime is 19996073. The reversal of 19996065 is 56069991.

It can be written as a sum of positive squares in 4 ways, for example, as 4028049 + 15968016 = 2007^2 + 3996^2 .

It is not a de Polignac number, because 19996065 - 2² = 19996061 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 19996065.

It is not an unprimeable number, because it can be changed into a prime (19996061) by changing a digit.

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 39 ways as a sum of consecutive naturals, for example, 39031 + ... + 39539.

It is an arithmetic number, because the mean of its divisors is an integer number (907137).

Almost surely, 2^19996065 is an apocalyptic number.

19996065 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

19996065 is a deficient number, since it is larger than the sum of its proper divisors (16289415).

19996065 is an equidigital number, since it uses as much as digits as its factorization.

19996065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 623 (or 614 counting only the distinct ones).

The product of its (nonzero) digits is 131220, while the sum is 45.

The square root of 19996065 is about 4471.6959869830. The cubic root of 19996065 is about 271.4239584363.

The spelling of 19996065 in words is "nineteen million, nine hundred ninety-six thousand, sixty-five".