20215241 has 2 divisors, whose sum is σ = 20215242. Its totient is φ = 20215240.

The previous prime is 20215211. The next prime is 20215267. The reversal of 20215241 is 14251202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20214016 + 1225 = 4496^2 + 35^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20215241 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20215211) 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, 10107620 + 10107621.

It is an arithmetic number, because the mean of its divisors is an integer number (10107621).

Almost surely, 2^20215241 is an apocalyptic number.

It is an amenable number.

20215241 is a deficient number, since it is larger than the sum of its proper divisors (1).

20215241 is an equidigital number, since it uses as much as digits as its factorization.

20215241 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 20215241 is about 4496.1362301425. The cubic root of 20215241 is about 272.4120457943.

Adding to 20215241 its reverse (14251202), we get a palindrome (34466443).

The spelling of 20215241 in words is "twenty million, two hundred fifteen thousand, two hundred forty-one".