20406466 has 8 divisors (see below), whose sum is σ = 30633660. Its totient is φ = 10195248.

The previous prime is 20406461. The next prime is 20406521. The reversal of 20406466 is 66460402.

20406466 is a nontrivial binomial coefficient, being equal to C(6389, 2).

It can be written as a sum of positive squares in 2 ways, for example, as 15249025 + 5157441 = 3905^2 + 2271^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (20406461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1 + ... + 6388.

Almost surely, 2^20406466 is an apocalyptic number.

20406466 is the 6388-th triangular number.

20406466 is the 2130-th centered nonagonal number.

20406466 is a deficient number, since it is larger than the sum of its proper divisors (10227194).

20406466 is a wasteful number, since it uses less digits than its factorization.

20406466 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7988.

The product of its (nonzero) digits is 6912, while the sum is 28.

The square root of 20406466 is about 4517.3516577747. The cubic root of 20406466 is about 273.2683072891.

Adding to 20406466 its reverse (66460402), we get a palindrome (86866868).

The spelling of 20406466 in words is "twenty million, four hundred six thousand, four hundred sixty-six".