20218441 has 2 divisors, whose sum is σ = 20218442. Its totient is φ = 20218440.

The previous prime is 20218439. The next prime is 20218459. The reversal of 20218441 is 14481202.

20218441 = 3179² + 3180².

20218441 is nontrivially palindromic in base 15.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10112400 + 10106041 = 3180^2 + 3179^2 .

It is a cyclic number.

It is not a de Polignac number, because 20218441 - 2¹ = 20218439 is a prime.

Together with 20218439, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (20218411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10109220 + 10109221.

It is an arithmetic number, because the mean of its divisors is an integer number (10109221).

Almost surely, 2^20218441 is an apocalyptic number.

20218441 is the 3180-th centered square number.

It is an amenable number.

20218441 is a deficient number, since it is larger than the sum of its proper divisors (1).

20218441 is an equidigital number, since it uses as much as digits as its factorization.

20218441 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 512, while the sum is 22.

The square root of 20218441 is about 4496.4920771642. The cubic root of 20218441 is about 272.4264189852.

Adding to 20218441 its reverse (14481202), we get a palindrome (34699643).

The spelling of 20218441 in words is "twenty million, two hundred eighteen thousand, four hundred forty-one".