20215446 has 16 divisors (see below), whose sum is σ = 40727664. Its totient is φ = 6689024.

The previous prime is 20215417. The next prime is 20215451. The reversal of 20215446 is 64451202.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 11475 + ... + 13118.

It is an arithmetic number, because the mean of its divisors is an integer number (2545479).

Almost surely, 2^20215446 is an apocalyptic number.

20215446 is an abundant number, since it is smaller than the sum of its proper divisors (20512218).

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

20215446 is a wasteful number, since it uses less digits than its factorization.

20215446 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24735.

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 20215446 is about 4496.1590274366. The cubic root of 20215446 is about 272.4129666224.

Adding to 20215446 its reverse (64451202), we get a palindrome (84666648).

The spelling of 20215446 in words is "twenty million, two hundred fifteen thousand, four hundred forty-six".