20550223 has 2 divisors, whose sum is σ = 20550224. Its totient is φ = 20550222.

The previous prime is 20550217. The next prime is 20550253. The reversal of 20550223 is 32205502.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20550223 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20550223.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20550253) 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 as a sum of consecutive naturals, namely, 10275111 + 10275112.

It is an arithmetic number, because the mean of its divisors is an integer number (10275112).

Almost surely, 2^20550223 is an apocalyptic number.

20550223 is a deficient number, since it is larger than the sum of its proper divisors (1).

20550223 is an equidigital number, since it uses as much as digits as its factorization.

20550223 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 600, while the sum is 19.

The square root of 20550223 is about 4533.2353788437. The cubic root of 20550223 is about 273.9085021360.

Adding to 20550223 its reverse (32205502), we get a palindrome (52755725).

The spelling of 20550223 in words is "twenty million, five hundred fifty thousand, two hundred twenty-three".