20466809 has 8 divisors (see below), whose sum is σ = 22931328. Its totient is φ = 18102960.

The previous prime is 20466773. The next prime is 20466847. The reversal of 20466809 is 90866402.

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

It is a cyclic number.

It is not a de Polignac number, because 20466809 - 2¹⁶ = 20401273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20466889) 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, 24737 + ... + 25550.

It is an arithmetic number, because the mean of its divisors is an integer number (2866416).

Almost surely, 2^20466809 is an apocalyptic number.

It is an amenable number.

20466809 is a deficient number, since it is larger than the sum of its proper divisors (2464519).

20466809 is a wasteful number, since it uses less digits than its factorization.

20466809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50335.

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 20466809 is about 4524.0257514740. The cubic root of 20466809 is about 273.5373985068.

The spelling of 20466809 in words is "twenty million, four hundred sixty-six thousand, eight hundred nine".