20664273 has 16 divisors (see below), whose sum is σ = 31633280. Its totient is φ = 11753856.

The previous prime is 20664257. The next prime is 20664289. The reversal of 20664273 is 37246602.

It is an interprime number because it is at equal distance from previous prime (20664257) and next prime (20664289).

It is not a de Polignac number, because 20664273 - 2⁴ = 20664257 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20664273.

It is not an unprimeable number, because it can be changed into a prime (20664473) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2661 + ... + 6957.

It is an arithmetic number, because the mean of its divisors is an integer number (1977080).

Almost surely, 2^20664273 is an apocalyptic number.

It is an amenable number.

20664273 is a deficient number, since it is larger than the sum of its proper divisors (10969007).

20664273 is a wasteful number, since it uses less digits than its factorization.

20664273 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4536.

The product of its (nonzero) digits is 12096, while the sum is 30.

The square root of 20664273 is about 4545.7972898052. The cubic root of 20664273 is about 274.4142817481.

The spelling of 20664273 in words is "twenty million, six hundred sixty-four thousand, two hundred seventy-three".