20665214606 has 16 divisors (see below), whose sum is σ = 33681845760. Its totient is φ = 9473018040.

The previous prime is 20665214579. The next prime is 20665214653. The reversal of 20665214606 is 60641256602.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20665214606.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8770136 + ... + 8772491.

It is an arithmetic number, because the mean of its divisors is an integer number (2105115360).

Almost surely, 2^20665214606 is an apocalyptic number.

20665214606 is a deficient number, since it is larger than the sum of its proper divisors (13016631154).

20665214606 is a wasteful number, since it uses less digits than its factorization.

20665214606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17542679.

The product of its (nonzero) digits is 103680, while the sum is 38.

The spelling of 20665214606 in words is "twenty billion, six hundred sixty-five million, two hundred fourteen thousand, six hundred six".