20866222 has 16 divisors (see below), whose sum is σ = 33909120. Its totient is φ = 9572832.

The previous prime is 20866211. The next prime is 20866229. The reversal of 20866222 is 22266802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20866229) 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, 2179 + ... + 6817.

It is an arithmetic number, because the mean of its divisors is an integer number (2119320).

Almost surely, 2^20866222 is an apocalyptic number.

20866222 is a deficient number, since it is larger than the sum of its proper divisors (13042898).

20866222 is a wasteful number, since it uses less digits than its factorization.

20866222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4827.

The product of its (nonzero) digits is 4608, while the sum is 28.

The square root of 20866222 is about 4567.9559980368. The cubic root of 20866222 is about 275.3053225939.

It can be divided in two parts, 208 and 66222, that added together give a triangular number (66430 = T₃₆₄).

The spelling of 20866222 in words is "twenty million, eight hundred sixty-six thousand, two hundred twenty-two".