20304481 has 2 divisors, whose sum is σ = 20304482. Its totient is φ = 20304480.

The previous prime is 20304463. The next prime is 20304497. The reversal of 20304481 is 18440302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10595025 + 9709456 = 3255^2 + 3116^2 .

It is a cyclic number.

It is not a de Polignac number, because 20304481 - 2¹⁷ = 20173409 is a prime.

It is a super-2 number, since 2×20304481² = 824543897358722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20304461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10152240 + 10152241.

It is an arithmetic number, because the mean of its divisors is an integer number (10152241).

Almost surely, 2^20304481 is an apocalyptic number.

It is an amenable number.

20304481 is a deficient number, since it is larger than the sum of its proper divisors (1).

20304481 is an equidigital number, since it uses as much as digits as its factorization.

20304481 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 20304481 is about 4506.0493783358. The cubic root of 20304481 is about 272.8123108926.

Adding to 20304481 its reverse (18440302), we get a palindrome (38744783).

The spelling of 20304481 in words is "twenty million, three hundred four thousand, four hundred eighty-one".