20856266 has 8 divisors (see below), whose sum is σ = 31797444. Its totient is φ = 10257120.

The previous prime is 20856259. The next prime is 20856317. The reversal of 20856266 is 66265802.

It can be written as a sum of positive squares in 2 ways, for example, as 20748025 + 108241 = 4555^2 + 329^2 .

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

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 85355 + ... + 85598.

Almost surely, 2^20856266 is an apocalyptic number.

20856266 is a deficient number, since it is larger than the sum of its proper divisors (10941178).

20856266 is a wasteful number, since it uses less digits than its factorization.

20856266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171016.

The product of its (nonzero) digits is 34560, while the sum is 35.

The square root of 20856266 is about 4566.8661027011. The cubic root of 20856266 is about 275.2615297143.

The spelling of 20856266 in words is "twenty million, eight hundred fifty-six thousand, two hundred sixty-six".