20184481 has 2 divisors, whose sum is σ = 20184482. Its totient is φ = 20184480.

The previous prime is 20184443. The next prime is 20184509. The reversal of 20184481 is 18448102.

It is an a-pointer prime, because the next prime (20184509) can be obtained adding 20184481 to its sum of digits (28).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16120225 + 4064256 = 4015^2 + 2016^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20184481 is a prime.

It is a super-2 number, since 2×20184481² = 814826546478722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20184181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10092240 + 10092241.

It is an arithmetic number, because the mean of its divisors is an integer number (10092241).

Almost surely, 2^20184481 is an apocalyptic number.

It is an amenable number.

20184481 is a deficient number, since it is larger than the sum of its proper divisors (1).

20184481 is an equidigital number, since it uses as much as digits as its factorization.

20184481 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2048, while the sum is 28.

The square root of 20184481 is about 4492.7142130343. The cubic root of 20184481 is about 272.2738060668.

The spelling of 20184481 in words is "twenty million, one hundred eighty-four thousand, four hundred eighty-one".