20866206 has 16 divisors (see below), whose sum is σ = 42520464. Its totient is φ = 6824064.

The previous prime is 20866201. The next prime is 20866207. The reversal of 20866206 is 60266802.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20866201) 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, 32491 + ... + 33126.

It is an arithmetic number, because the mean of its divisors is an integer number (2657529).

Almost surely, 2^20866206 is an apocalyptic number.

20866206 is an abundant number, since it is smaller than the sum of its proper divisors (21654258).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20866206 is a wasteful number, since it uses less digits than its factorization.

20866206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65675.

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 20866206 is about 4567.9542467061. The cubic root of 20866206 is about 275.3052522268.

The spelling of 20866206 in words is "twenty million, eight hundred sixty-six thousand, two hundred six".