20308317 has 16 divisors (see below), whose sum is σ = 28170240. Its totient is φ = 12999600.

The previous prime is 20308291. The next prime is 20308339. The reversal of 20308317 is 71380302.

It is not a de Polignac number, because 20308317 - 2⁸ = 20308061 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20308367) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12142 + ... + 13712.

It is an arithmetic number, because the mean of its divisors is an integer number (1760640).

Almost surely, 2^20308317 is an apocalyptic number.

It is an amenable number.

20308317 is a deficient number, since it is larger than the sum of its proper divisors (7861923).

20308317 is a wasteful number, since it uses less digits than its factorization.

20308317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1744.

The product of its (nonzero) digits is 1008, while the sum is 24.

The square root of 20308317 is about 4506.4750082520. The cubic root of 20308317 is about 272.8294900582.

Adding to 20308317 its reverse (71380302), we get a palindrome (91688619).

The spelling of 20308317 in words is "twenty million, three hundred eight thousand, three hundred seventeen".