20964165 has 16 divisors (see below), whose sum is σ = 33605376. Its totient is φ = 11160000.

The previous prime is 20964157. The next prime is 20964169. The reversal of 20964165 is 56146902.

It is not a de Polignac number, because 20964165 - 2³ = 20964157 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20964169) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10335 + ... + 12195.

It is an arithmetic number, because the mean of its divisors is an integer number (2100336).

Almost surely, 2^20964165 is an apocalyptic number.

It is an amenable number.

20964165 is a deficient number, since it is larger than the sum of its proper divisors (12641211).

20964165 is a wasteful number, since it uses less digits than its factorization.

20964165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2620.

The product of its (nonzero) digits is 12960, while the sum is 33.

The square root of 20964165 is about 4578.6641064835. The cubic root of 20964165 is about 275.7353980553.

The spelling of 20964165 in words is "twenty million, nine hundred sixty-four thousand, one hundred sixty-five".