20331217 has 8 divisors (see below), whose sum is σ = 21117536. Its totient is φ = 19559232.

The previous prime is 20331209. The next prime is 20331253. The reversal of 20331217 is 71213302.

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 20331217 - 2³ = 20331209 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20331194 and 20331203.

It is not an unprimeable number, because it can be changed into a prime (20331317) 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, 648 + ... + 6409.

It is an arithmetic number, because the mean of its divisors is an integer number (2639692).

Almost surely, 2^20331217 is an apocalyptic number.

It is an amenable number.

20331217 is a deficient number, since it is larger than the sum of its proper divisors (786319).

20331217 is an equidigital number, since it uses as much as digits as its factorization.

20331217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7167.

The product of its (nonzero) digits is 252, while the sum is 19.

The square root of 20331217 is about 4509.0150809240. The cubic root of 20331217 is about 272.9320005784.

Adding to 20331217 its reverse (71213302), we get a palindrome (91544519).

The spelling of 20331217 in words is "twenty million, three hundred thirty-one thousand, two hundred seventeen".