20313215 has 32 divisors (see below), whose sum is σ = 28740096. Its totient is φ = 13639680.

The previous prime is 20313203. The next prime is 20313229. The reversal of 20313215 is 51231302.

It is not a de Polignac number, because 20313215 - 2⁸ = 20312959 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Duffinian number.

It is a plaindrome in base 14.

It is a junction number, because it is equal to n+sod(n) for n = 20313193 and 20313202.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 33959 + ... + 34551.

It is an arithmetic number, because the mean of its divisors is an integer number (898128).

Almost surely, 2^20313215 is an apocalyptic number.

20313215 is a deficient number, since it is larger than the sum of its proper divisors (8426881).

20313215 is a wasteful number, since it uses less digits than its factorization.

20313215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 659.

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

The square root of 20313215 is about 4507.0184157600. The cubic root of 20313215 is about 272.8514221468.

Adding to 20313215 its reverse (51231302), we get a palindrome (71544517).

The spelling of 20313215 in words is "twenty million, three hundred thirteen thousand, two hundred fifteen".