20215466 has 8 divisors (see below), whose sum is σ = 30353700. Its totient is φ = 10097568.

The previous prime is 20215463. The next prime is 20215513. The reversal of 20215466 is 66451202.

It can be written as a sum of positive squares in 2 ways, for example, as 19989841 + 225625 = 4471^2 + 475^2 .

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 (20215463) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2291 + ... + 6758.

Almost surely, 2^20215466 is an apocalyptic number.

20215466 is a deficient number, since it is larger than the sum of its proper divisors (10138234).

20215466 is a wasteful number, since it uses less digits than its factorization.

20215466 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10168.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 20215466 is about 4496.1612515567. The cubic root of 20215466 is about 272.4130564589.

Adding to 20215466 its reverse (66451202), we get a palindrome (86666668).

The spelling of 20215466 in words is "twenty million, two hundred fifteen thousand, four hundred sixty-six".