20217241 has 4 divisors (see below), whose sum is σ = 22055184. Its totient is φ = 18379300.

The previous prime is 20217229. The next prime is 20217259. The reversal of 20217241 is 14271202.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20217241 - 2⁵ = 20217209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20217341) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 918955 + ... + 918976.

It is an arithmetic number, because the mean of its divisors is an integer number (5513796).

Almost surely, 2^20217241 is an apocalyptic number.

It is an amenable number.

20217241 is a deficient number, since it is larger than the sum of its proper divisors (1837943).

20217241 is a wasteful number, since it uses less digits than its factorization.

20217241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1837942.

The product of its (nonzero) digits is 224, while the sum is 19.

The square root of 20217241 is about 4496.3586378313. The cubic root of 20217241 is about 272.4210292164.

Adding to 20217241 its reverse (14271202), we get a palindrome (34488443).

The spelling of 20217241 in words is "twenty million, two hundred seventeen thousand, two hundred forty-one".