20715315 has 32 divisors (see below), whose sum is σ = 34338816. Its totient is φ = 10657920.

The previous prime is 20715271. The next prime is 20715319. The reversal of 20715315 is 51351702.

It is not a de Polignac number, because 20715315 - 2⁸ = 20715059 is a prime.

It is a super-3 number, since 3×20715315³ (a number of 23 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (20715319) 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 31 ways as a sum of consecutive naturals, for example, 56262 + ... + 56628.

It is an arithmetic number, because the mean of its divisors is an integer number (1073088).

Almost surely, 2^20715315 is an apocalyptic number.

20715315 is a deficient number, since it is larger than the sum of its proper divisors (13623501).

20715315 is a wasteful number, since it uses less digits than its factorization.

20715315 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 499.

The product of its (nonzero) digits is 1050, while the sum is 24.

The square root of 20715315 is about 4551.4080238977. The cubic root of 20715315 is about 274.6400359139.

The spelling of 20715315 in words is "twenty million, seven hundred fifteen thousand, three hundred fifteen".