20665222 has 8 divisors (see below), whose sum is σ = 31523400. Its totient is φ = 10157424.

The previous prime is 20665213. The next prime is 20665237. The reversal of 20665222 is 22256602.

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

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 3 ways as a sum of consecutive naturals, for example, 87447 + ... + 87682.

It is an arithmetic number, because the mean of its divisors is an integer number (3940425).

Almost surely, 2^20665222 is an apocalyptic number.

20665222 is a deficient number, since it is larger than the sum of its proper divisors (10858178).

20665222 is a wasteful number, since it uses less digits than its factorization.

20665222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175190.

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 20665222 is about 4545.9016707360. The cubic root of 20665222 is about 274.4184824793.

The spelling of 20665222 in words is "twenty million, six hundred sixty-five thousand, two hundred twenty-two".