20217441 has 4 divisors (see below), whose sum is σ = 26956592. Its totient is φ = 13478292.

The previous prime is 20217427. The next prime is 20217467. The reversal of 20217441 is 14471202.

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 not a de Polignac number, because 20217441 - 2⁵ = 20217409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20217401) 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 in 3 ways as a sum of consecutive naturals, for example, 3369571 + ... + 3369576.

It is an arithmetic number, because the mean of its divisors is an integer number (6739148).

Almost surely, 2^20217441 is an apocalyptic number.

It is an amenable number.

20217441 is a deficient number, since it is larger than the sum of its proper divisors (6739151).

20217441 is an equidigital number, since it uses as much as digits as its factorization.

20217441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6739150.

The product of its (nonzero) digits is 448, while the sum is 21.

The square root of 20217441 is about 4496.3808779951. The cubic root of 20217441 is about 272.4219275260.

Adding to 20217441 its reverse (14471202), we get a palindrome (34688643).

The spelling of 20217441 in words is "twenty million, two hundred seventeen thousand, four hundred forty-one".