20321315 has 16 divisors (see below), whose sum is σ = 28831680. Its totient is φ = 13453440.

The previous prime is 20321303. The next prime is 20321339. The reversal of 20321315 is 51312302.

It is a de Polignac number, because none of the positive numbers 2^k-20321315 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20321293 and 20321302.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8996 + ... + 11025.

It is an arithmetic number, because the mean of its divisors is an integer number (1801980).

Almost surely, 2^20321315 is an apocalyptic number.

20321315 is a deficient number, since it is larger than the sum of its proper divisors (8510365).

20321315 is a wasteful number, since it uses less digits than its factorization.

20321315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20062.

The product of its (nonzero) digits is 180, while the sum is 17.

The square root of 20321315 is about 4507.9169247004. The cubic root of 20321315 is about 272.8876843013.

Adding to 20321315 its reverse (51312302), we get a palindrome (71633617).

The spelling of 20321315 in words is "twenty million, three hundred twenty-one thousand, three hundred fifteen".