20666320207465 has 16 divisors (see below), whose sum is σ = 24942067862400. Its totient is φ = 16438096265472.

The previous prime is 20666320207447. The next prime is 20666320207471. The reversal of 20666320207465 is 56470202366602.

It is a cyclic number.

It is not a de Polignac number, because 20666320207465 - 2¹⁵ = 20666320174697 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3856801 + ... + 7497169.

It is an arithmetic number, because the mean of its divisors is an integer number (1558879241400).

Almost surely, 2^{20666320207465} is an apocalyptic number.

It is an amenable number.

20666320207465 is a deficient number, since it is larger than the sum of its proper divisors (4275747654935).

20666320207465 is a wasteful number, since it uses less digits than its factorization.

20666320207465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3646896.

The product of its (nonzero) digits is 4354560, while the sum is 49.

The spelling of 20666320207465 in words is "twenty trillion, six hundred sixty-six billion, three hundred twenty million, two hundred seven thousand, four hundred sixty-five".