20258866 has 16 divisors (see below), whose sum is σ = 32466744. Its totient is φ = 9447424.

The previous prime is 20258863. The next prime is 20258867. The reversal of 20258866 is 66885202.

It can be written as a sum of positive squares in 4 ways, for example, as 14280841 + 5978025 = 3779^2 + 2445^2 .

It is not an unprimeable number, because it can be changed into a prime (20258863) 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, 1206 + ... + 6478.

Almost surely, 2^20258866 is an apocalyptic number.

20258866 is a deficient number, since it is larger than the sum of its proper divisors (12207878).

20258866 is a wasteful number, since it uses less digits than its factorization.

20258866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5405.

The product of its (nonzero) digits is 46080, while the sum is 37.

The square root of 20258866 is about 4500.9850033076. The cubic root of 20258866 is about 272.6078623582.

The spelling of 20258866 in words is "twenty million, two hundred fifty-eight thousand, eight hundred sixty-six".