20650665105 has 72 divisors (see below), whose sum is σ = 42106732200. Its totient is φ = 9334144512.

The previous prime is 20650665053. The next prime is 20650665151. The reversal of 20650665105 is 50156605602.

It is a happy number.

20650665105 is a `hidden beast` number, since 20 + 65 + 0 + 66 + 510 + 5 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 4003472529 + 16647192576 = 63273^2 + 129024^2 .

It is not a de Polignac number, because 20650665105 - 2¹⁰ = 20650664081 is a prime.

It is a super-2 number, since 2×20650665105² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20650665105.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 143631 + ... + 248859.

It is an arithmetic number, because the mean of its divisors is an integer number (584815725).

Almost surely, 2^20650665105 is an apocalyptic number.

It is an amenable number.

20650665105 is an abundant number, since it is smaller than the sum of its proper divisors (21456067095).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20650665105 is a wasteful number, since it uses less digits than its factorization.

20650665105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105343 (or 105333 counting only the distinct ones).

The product of its (nonzero) digits is 54000, while the sum is 36.

The spelling of 20650665105 in words is "twenty billion, six hundred fifty million, six hundred sixty-five thousand, one hundred five".