20516315 has 8 divisors (see below), whose sum is σ = 25285200. Its totient is φ = 15969312.

The previous prime is 20516281. The next prime is 20516323. The reversal of 20516315 is 51361502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20516315 - 2¹⁰ = 20515291 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55265 + ... + 55634.

It is an arithmetic number, because the mean of its divisors is an integer number (3160650).

Almost surely, 2^20516315 is an apocalyptic number.

20516315 is a deficient number, since it is larger than the sum of its proper divisors (4768885).

20516315 is a wasteful number, since it uses less digits than its factorization.

20516315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110941.

The product of its (nonzero) digits is 900, while the sum is 23.

The square root of 20516315 is about 4529.4939010887. The cubic root of 20516315 is about 273.7577689392.

Adding to 20516315 its reverse (51361502), we get a palindrome (71877817).

The spelling of 20516315 in words is "twenty million, five hundred sixteen thousand, three hundred fifteen".