20446221 has 8 divisors (see below), whose sum is σ = 27526720. Its totient is φ = 13498272.

The previous prime is 20446213. The next prime is 20446243. The reversal of 20446221 is 12264402.

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

It is not a de Polignac number, because 20446221 - 2³ = 20446213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20446271) 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, 32776 + ... + 33393.

It is an arithmetic number, because the mean of its divisors is an integer number (3440840).

Almost surely, 2^20446221 is an apocalyptic number.

It is an amenable number.

20446221 is a deficient number, since it is larger than the sum of its proper divisors (7080499).

20446221 is a wasteful number, since it uses less digits than its factorization.

20446221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66275.

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 20446221 is about 4521.7497719356. The cubic root of 20446221 is about 273.4456486997.

The spelling of 20446221 in words is "twenty million, four hundred forty-six thousand, two hundred twenty-one".