20912205 has 8 divisors (see below), whose sum is σ = 33459552. Its totient is φ = 11153168.

The previous prime is 20912191. The next prime is 20912207. The reversal of 20912205 is 50221902.

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

It is a cyclic number.

It is not a de Polignac number, because 20912205 - 2⁴ = 20912189 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20912207) 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 7 ways as a sum of consecutive naturals, for example, 697059 + ... + 697088.

It is an arithmetic number, because the mean of its divisors is an integer number (4182444).

Almost surely, 2^20912205 is an apocalyptic number.

It is an amenable number.

20912205 is a deficient number, since it is larger than the sum of its proper divisors (12547347).

20912205 is a wasteful number, since it uses less digits than its factorization.

20912205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1394155.

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 20912205 is about 4572.9864421404. The cubic root of 20912205 is about 275.5074048051.

The spelling of 20912205 in words is "twenty million, nine hundred twelve thousand, two hundred five".