20718241 has 2 divisors, whose sum is σ = 20718242. Its totient is φ = 20718240.

The previous prime is 20718233. The next prime is 20718259. The reversal of 20718241 is 14281702.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12285025 + 8433216 = 3505^2 + 2904^2 .

It is a cyclic number.

It is not a de Polignac number, because 20718241 - 2³ = 20718233 is a prime.

It is not a weakly prime, because it can be changed into another prime (20718281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10359120 + 10359121.

It is an arithmetic number, because the mean of its divisors is an integer number (10359121).

Almost surely, 2^20718241 is an apocalyptic number.

It is an amenable number.

20718241 is a deficient number, since it is larger than the sum of its proper divisors (1).

20718241 is an equidigital number, since it uses as much as digits as its factorization.

20718241 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 896, while the sum is 25.

The square root of 20718241 is about 4551.7294515382. The cubic root of 20718241 is about 274.6529661045.

Adding to 20718241 its reverse (14281702), we get a palindrome (34999943).

The spelling of 20718241 in words is "twenty million, seven hundred eighteen thousand, two hundred forty-one".