20045217 has 8 divisors (see below), whose sum is σ = 27103680. Its totient is φ = 13175120.

The previous prime is 20045197. The next prime is 20045237. The reversal of 20045217 is 71254002.

It is an interprime number because it is at equal distance from previous prime (20045197) and next prime (20045237).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20045217 - 2⁷ = 20045089 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20045193 and 20045202.

It is not an unprimeable number, because it can be changed into a prime (20045237) 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 7 ways as a sum of consecutive naturals, for example, 46842 + ... + 47267.

It is an arithmetic number, because the mean of its divisors is an integer number (3387960).

Almost surely, 2^20045217 is an apocalyptic number.

It is an amenable number.

20045217 is a deficient number, since it is larger than the sum of its proper divisors (7058463).

20045217 is an equidigital number, since it uses as much as digits as its factorization.

20045217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94183.

The product of its (nonzero) digits is 560, while the sum is 21.

The square root of 20045217 is about 4477.1885151287. The cubic root of 20045217 is about 271.6461707263.

Adding to 20045217 its reverse (71254002), we get a palindrome (91299219).

The spelling of 20045217 in words is "twenty million, forty-five thousand, two hundred seventeen".