20532217 has 12 divisors (see below), whose sum is σ = 22109520. Its totient is φ = 19010376.

The previous prime is 20532191. The next prime is 20532227. The reversal of 20532217 is 71223502.

It is not a de Polignac number, because 20532217 - 2¹⁵ = 20499449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20532227) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 161608 + ... + 161734.

It is an arithmetic number, because the mean of its divisors is an integer number (1842460).

Almost surely, 2^20532217 is an apocalyptic number.

It is an amenable number.

20532217 is a deficient number, since it is larger than the sum of its proper divisors (1577303).

20532217 is an equidigital number, since it uses as much as digits as its factorization.

20532217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 340 (or 213 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 22.

The square root of 20532217 is about 4531.2489448275. The cubic root of 20532217 is about 273.8284796848.

Adding to 20532217 its reverse (71223502), we get a palindrome (91755719).

The spelling of 20532217 in words is "twenty million, five hundred thirty-two thousand, two hundred seventeen".