20288655 has 12 divisors (see below), whose sum is σ = 35167080. Its totient is φ = 10820592.

The previous prime is 20288651. The next prime is 20288657. The reversal of 20288655 is 55688202.

It is not a de Polignac number, because 20288655 - 2² = 20288651 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20288651) 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 11 ways as a sum of consecutive naturals, for example, 225385 + ... + 225474.

It is an arithmetic number, because the mean of its divisors is an integer number (2930590).

Almost surely, 2^20288655 is an apocalyptic number.

20288655 is a deficient number, since it is larger than the sum of its proper divisors (14878425).

20288655 is a wasteful number, since it uses less digits than its factorization.

20288655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 450870 (or 450867 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 36.

The square root of 20288655 is about 4504.2929522845. The cubic root of 20288655 is about 272.7414127517.

The spelling of 20288655 in words is "twenty million, two hundred eighty-eight thousand, six hundred fifty-five".