20666466 has 24 divisors (see below), whose sum is σ = 46725120. Its totient is φ = 6589176.

The previous prime is 20666453. The next prime is 20666521. The reversal of 20666466 is 66466602.

It is a self number, because there is not a number n which added to its sum of digits gives 20666466.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 24546 + ... + 25373.

It is an arithmetic number, because the mean of its divisors is an integer number (1946880).

Almost surely, 2^20666466 is an apocalyptic number.

20666466 is an abundant number, since it is smaller than the sum of its proper divisors (26058654).

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

20666466 is a wasteful number, since it uses less digits than its factorization.

20666466 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49950 (or 49947 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 36.

The square root of 20666466 is about 4546.0384952176. The cubic root of 20666466 is about 274.4239888278.

The spelling of 20666466 in words is "twenty million, six hundred sixty-six thousand, four hundred sixty-six".