20086866 has 56 divisors (see below), whose sum is σ = 47217600. Its totient is φ = 6393816.

The previous prime is 20086849. The next prime is 20086867. The reversal of 20086866 is 66868002.

It is a self number, because there is not a number n which added to its sum of digits gives 20086866.

It is not an unprimeable number, because it can be changed into a prime (20086867) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 33235 + ... + 33833.

Almost surely, 2^20086866 is an apocalyptic number.

20086866 is the 2396-th nonagonal number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20086866, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23608800).

20086866 is an abundant number, since it is smaller than the sum of its proper divisors (27130734).

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

20086866 is an equidigital number, since it uses as much as digits as its factorization.

20086866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 642 (or 627 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The square root of 20086866 is about 4481.8373464462. The cubic root of 20086866 is about 271.8341784132.

The spelling of 20086866 in words is "twenty million, eighty-six thousand, eight hundred sixty-six".