20354221 has 2 divisors, whose sum is σ = 20354222. Its totient is φ = 20354220.

The previous prime is 20354203. The next prime is 20354231. The reversal of 20354221 is 12245302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19980900 + 373321 = 4470^2 + 611^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20354221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20354231) 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, 10177110 + 10177111.

It is an arithmetic number, because the mean of its divisors is an integer number (10177111).

Almost surely, 2^20354221 is an apocalyptic number.

It is an amenable number.

20354221 is a deficient number, since it is larger than the sum of its proper divisors (1).

20354221 is an equidigital number, since it uses as much as digits as its factorization.

20354221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 20354221 is about 4511.5652494450. The cubic root of 20354221 is about 273.0348991777.

Adding to 20354221 its reverse (12245302), we get a palindrome (32599523).

The spelling of 20354221 in words is "twenty million, three hundred fifty-four thousand, two hundred twenty-one".