20864165 has 8 divisors (see below), whose sum is σ = 28613760. Its totient is φ = 14306832.

The previous prime is 20864161. The next prime is 20864171. The reversal of 20864165 is 56146802.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20864165 - 2² = 20864161 is a prime.

It is a super-2 number, since 2×20864165² = 870626762294450, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20864161) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 298025 + ... + 298094.

It is an arithmetic number, because the mean of its divisors is an integer number (3576720).

Almost surely, 2^20864165 is an apocalyptic number.

It is an amenable number.

20864165 is a deficient number, since it is larger than the sum of its proper divisors (7749595).

20864165 is an equidigital number, since it uses as much as digits as its factorization.

20864165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 596131.

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 20864165 is about 4567.7308370787. The cubic root of 20864165 is about 275.2962757292.

The spelling of 20864165 in words is "twenty million, eight hundred sixty-four thousand, one hundred sixty-five".