20655223 has 4 divisors (see below), whose sum is σ = 21742360. Its totient is φ = 19568088.

The previous prime is 20655203. The next prime is 20655227. The reversal of 20655223 is 32255602.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20655223 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20655227) 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, 543540 + ... + 543577.

It is an arithmetic number, because the mean of its divisors is an integer number (5435590).

Almost surely, 2^20655223 is an apocalyptic number.

20655223 is a deficient number, since it is larger than the sum of its proper divisors (1087137).

20655223 is a wasteful number, since it uses less digits than its factorization.

20655223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1087136.

The product of its (nonzero) digits is 3600, while the sum is 25.

The square root of 20655223 is about 4544.8017558525. The cubic root of 20655223 is about 274.3742156255.

The spelling of 20655223 in words is "twenty million, six hundred fifty-five thousand, two hundred twenty-three".