20312115 has 16 divisors (see below), whose sum is σ = 32817408. Its totient is φ = 10727136.

The previous prime is 20312113. The next prime is 20312137. The reversal of 20312115 is 51121302.

It is not a de Polignac number, because 20312115 - 2¹ = 20312113 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a junction number, because it is equal to n+sod(n) for n = 20312094 and 20312103.

It is not an unprimeable number, because it can be changed into a prime (20312111) 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 15 ways as a sum of consecutive naturals, for example, 5029 + ... + 8118.

It is an arithmetic number, because the mean of its divisors is an integer number (2051088).

Almost surely, 2^20312115 is an apocalyptic number.

20312115 is a deficient number, since it is larger than the sum of its proper divisors (12505293).

20312115 is a wasteful number, since it uses less digits than its factorization.

20312115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13258.

The product of its (nonzero) digits is 60, while the sum is 15.

The square root of 20312115 is about 4506.8963822125. The cubic root of 20312115 is about 272.8464969133.

Adding to 20312115 its reverse (51121302), we get a palindrome (71433417).

The spelling of 20312115 in words is "twenty million, three hundred twelve thousand, one hundred fifteen".