20666292 has 12 divisors (see below), whose sum is σ = 48221376. Its totient is φ = 6888760.

The previous prime is 20666287. The next prime is 20666293. The reversal of 20666292 is 29266602.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20666293) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 861084 + ... + 861107.

It is an arithmetic number, because the mean of its divisors is an integer number (4018448).

Almost surely, 2^20666292 is an apocalyptic number.

It is an amenable number.

20666292 is an abundant number, since it is smaller than the sum of its proper divisors (27555084).

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

20666292 is a wasteful number, since it uses less digits than its factorization.

20666292 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1722198 (or 1722196 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 33.

The square root of 20666292 is about 4546.0193576359. The cubic root of 20666292 is about 274.4232186605.

The spelling of 20666292 in words is "twenty million, six hundred sixty-six thousand, two hundred ninety-two".