20550285 has 24 divisors (see below), whose sum is σ = 40709760. Its totient is φ = 9394272.

The previous prime is 20550269. The next prime is 20550287. The reversal of 20550285 is 58205502.

It is not a de Polignac number, because 20550285 - 2⁴ = 20550269 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20550287) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 32305 + ... + 32934.

It is an arithmetic number, because the mean of its divisors is an integer number (1696240).

Almost surely, 2^20550285 is an apocalyptic number.

It is an amenable number.

20550285 is a deficient number, since it is larger than the sum of its proper divisors (20159475).

20550285 is a wasteful number, since it uses less digits than its factorization.

20550285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65257 (or 65254 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 27.

The square root of 20550285 is about 4533.2422172216. The cubic root of 20550285 is about 273.9087775963.

Adding to 20550285 its reverse (58205502), we get a palindrome (78755787).

The spelling of 20550285 in words is "twenty million, five hundred fifty thousand, two hundred eighty-five".