20706165 has 16 divisors (see below), whose sum is σ = 36811200. Its totient is φ = 11043216.

The previous prime is 20706151. The next prime is 20706167. The reversal of 20706165 is 56160702.

It is not a de Polignac number, because 20706165 - 2⁹ = 20705653 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20706167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 76555 + ... + 76824.

It is an arithmetic number, because the mean of its divisors is an integer number (2300700).

Almost surely, 2^20706165 is an apocalyptic number.

It is an amenable number.

20706165 is a deficient number, since it is larger than the sum of its proper divisors (16105035).

20706165 is a wasteful number, since it uses less digits than its factorization.

20706165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153393 (or 153387 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 27.

The square root of 20706165 is about 4550.4027294296. The cubic root of 20706165 is about 274.5995935904.

Adding to 20706165 its reverse (56160702), we get a palindrome (76866867).

The spelling of 20706165 in words is "twenty million, seven hundred six thousand, one hundred sixty-five".