20865316 has 12 divisors (see below), whose sum is σ = 36658188. Its totient is φ = 10391552.

The previous prime is 20865311. The next prime is 20865319. The reversal of 20865316 is 61356802.

It can be written as a sum of positive squares in 2 ways, for example, as 16646400 + 4218916 = 4080^2 + 2054^2 .

It is a super-2 number, since 2×20865316² = 870722823559712, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20865311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9121 + ... + 11176.

It is an arithmetic number, because the mean of its divisors is an integer number (3054849).

Almost surely, 2^20865316 is an apocalyptic number.

It is an amenable number.

20865316 is a deficient number, since it is larger than the sum of its proper divisors (15792872).

20865316 is a wasteful number, since it uses less digits than its factorization.

20865316 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20558 (or 20556 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 20865316 is about 4567.8568278789. The cubic root of 20865316 is about 275.3013380004.

The spelling of 20865316 in words is "twenty million, eight hundred sixty-five thousand, three hundred sixteen".