20354281 has 2 divisors, whose sum is σ = 20354282. Its totient is φ = 20354280.

The previous prime is 20354239. The next prime is 20354291. The reversal of 20354281 is 18245302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18705625 + 1648656 = 4325^2 + 1284^2 .

It is a cyclic number.

It is not a de Polignac number, because 20354281 - 2⁷ = 20354153 is a prime.

It is a super-2 number, since 2×20354281² = 828593510053922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20354221) 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, 10177140 + 10177141.

It is an arithmetic number, because the mean of its divisors is an integer number (10177141).

Almost surely, 2^20354281 is an apocalyptic number.

It is an amenable number.

20354281 is a deficient number, since it is larger than the sum of its proper divisors (1).

20354281 is an equidigital number, since it uses as much as digits as its factorization.

20354281 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 20354281 is about 4511.5718990170. The cubic root of 20354281 is about 273.0351674608.

Adding to 20354281 its reverse (18245302), we get a palindrome (38599583).

The spelling of 20354281 in words is "twenty million, three hundred fifty-four thousand, two hundred eighty-one".