20446866 has 48 divisors (see below), whose sum is σ = 49652928. Its totient is φ = 6026400.

The previous prime is 20446861. The next prime is 20446871. The reversal of 20446866 is 66864402.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20446861) and next prime (20446871).

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20446866.

It is not an unprimeable number, because it can be changed into a prime (20446861) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5931 + ... + 8721.

It is an arithmetic number, because the mean of its divisors is an integer number (1034436).

Almost surely, 2^20446866 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20446866, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24826464).

20446866 is an abundant number, since it is smaller than the sum of its proper divisors (29206062).

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

20446866 is a wasteful number, since it uses less digits than its factorization.

20446866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2847 (or 2844 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 36.

The square root of 20446866 is about 4521.8210933207. The cubic root of 20446866 is about 273.4485240573.

It can be divided in two parts, 20446 and 866, that added together give a palindrome (21312).

The spelling of 20446866 in words is "twenty million, four hundred forty-six thousand, eight hundred sixty-six".