20666112 has 72 divisors (see below), whose sum is σ = 55923840. Its totient is φ = 6773760.

The previous prime is 20666111. The next prime is 20666143. The reversal of 20666112 is 21166602.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20666111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54339 + ... + 54717.

It is an arithmetic number, because the mean of its divisors is an integer number (776720).

Almost surely, 2^20666112 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20666112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27961920).

20666112 is an abundant number, since it is smaller than the sum of its proper divisors (35257728).

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

20666112 is an equidigital number, since it uses as much as digits as its factorization.

20666112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 469 (or 455 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 20666112 is about 4545.9995600528. Note that the first 3 decimals coincide. The cubic root of 20666112 is about 274.4224219311.

The spelling of 20666112 in words is "twenty million, six hundred sixty-six thousand, one hundred twelve".