20815466 has 16 divisors (see below), whose sum is σ = 35838720. Its totient is φ = 8882160.

The previous prime is 20815453. The next prime is 20815481. The reversal of 20815466 is 66451802.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 236 + ... + 6456.

It is an arithmetic number, because the mean of its divisors is an integer number (2239920).

Almost surely, 2^20815466 is an apocalyptic number.

20815466 is a deficient number, since it is larger than the sum of its proper divisors (15023254).

20815466 is a wasteful number, since it uses less digits than its factorization.

20815466 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6469.

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 20815466 is about 4562.3969577405. The cubic root of 20815466 is about 275.0819193964.

The spelling of 20815466 in words is "twenty million, eight hundred fifteen thousand, four hundred sixty-six".