20550317 has 4 divisors (see below), whose sum is σ = 20592000. Its totient is φ = 20508636.

The previous prime is 20550301. The next prime is 20550319. The reversal of 20550317 is 71305502.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20550317 - 2⁴ = 20550301 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20550292 and 20550301.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20550319) 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 3 ways as a sum of consecutive naturals, for example, 20093 + ... + 21090.

It is an arithmetic number, because the mean of its divisors is an integer number (5148000).

Almost surely, 2^20550317 is an apocalyptic number.

It is an amenable number.

20550317 is a deficient number, since it is larger than the sum of its proper divisors (41683).

20550317 is an equidigital number, since it uses as much as digits as its factorization.

20550317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41682.

The product of its (nonzero) digits is 1050, while the sum is 23.

The square root of 20550317 is about 4533.2457467029. The cubic root of 20550317 is about 273.9089197691.

Adding to 20550317 its reverse (71305502), we get a palindrome (91855819).

The spelling of 20550317 in words is "twenty million, five hundred fifty thousand, three hundred seventeen".