20317530 has 32 divisors (see below), whose sum is σ = 48996864. Its totient is φ = 5391936.

The previous prime is 20317529. The next prime is 20317541. The reversal of 20317530 is 3571302.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 20317497 and 20317506.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5172 + ... + 8208.

It is an arithmetic number, because the mean of its divisors is an integer number (1531152).

Almost surely, 2^20317530 is an apocalyptic number.

20317530 is an abundant number, since it is smaller than the sum of its proper divisors (28679334).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20317530 is a wasteful number, since it uses less digits than its factorization.

20317530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3270.

The product of its (nonzero) digits is 630, while the sum is 21.

The square root of 20317530 is about 4507.4970881854. The cubic root of 20317530 is about 272.8707407781.

Adding to 20317530 its reverse (3571302), we get a palindrome (23888832).

The spelling of 20317530 in words is "twenty million, three hundred seventeen thousand, five hundred thirty".