19660005 has 12 divisors (see below), whose sum is σ = 34077420. Its totient is φ = 10485312.

The previous prime is 19660001. The next prime is 19660013. The reversal of 19660005 is 50006691.

It can be written as a sum of positive squares in 2 ways, for example, as 6395841 + 13264164 = 2529^2 + 3642^2 .

It is not a de Polignac number, because 19660005 - 2² = 19660001 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19660001) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 218400 + ... + 218489.

It is an arithmetic number, because the mean of its divisors is an integer number (2839785).

Almost surely, 2^19660005 is an apocalyptic number.

19660005 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

19660005 is a deficient number, since it is larger than the sum of its proper divisors (14417415).

19660005 is a wasteful number, since it uses less digits than its factorization.

19660005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 436900 (or 436897 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 27.

The square root of 19660005 is about 4433.9604193091. The cubic root of 19660005 is about 269.8948149950.

Adding to 19660005 its reverse (50006691), we get a palindrome (69666696).

The spelling of 19660005 in words is "nineteen million, six hundred sixty thousand, five".