20366722665 has 24 divisors (see below), whose sum is σ = 35580300288. Its totient is φ = 10776719520.

The previous prime is 20366722601. The next prime is 20366722667. The reversal of 20366722665 is 56622766302.

It is a happy number.

20366722665 is a `hidden beast` number, since 2 + 0 + 366 + 7 + 226 + 65 = 666.

It is not a de Polignac number, because 20366722665 - 2⁶ = 20366722601 is a prime.

It is a super-3 number, since 3×20366722665³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

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 20366722665.

It is not an unprimeable number, because it can be changed into a prime (20366722667) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1776151 + ... + 1787580.

It is an arithmetic number, because the mean of its divisors is an integer number (1482512512).

Almost surely, 2^20366722665 is an apocalyptic number.

It is an amenable number.

20366722665 is a deficient number, since it is larger than the sum of its proper divisors (15213577623).

20366722665 is a wasteful number, since it uses less digits than its factorization.

20366722665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3563869 (or 3563866 counting only the distinct ones).

The product of its (nonzero) digits is 1088640, while the sum is 45.

The spelling of 20366722665 in words is "twenty billion, three hundred sixty-six million, seven hundred twenty-two thousand, six hundred sixty-five".