20687315 has 8 divisors (see below), whose sum is σ = 27081648. Its totient is φ = 15045280.

The previous prime is 20687311. The next prime is 20687321. The reversal of 20687315 is 51378602.

It is a happy number.

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

It is not a de Polignac number, because 20687315 - 2² = 20687311 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20687311) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 188012 + ... + 188121.

It is an arithmetic number, because the mean of its divisors is an integer number (3385206).

Almost surely, 2^20687315 is an apocalyptic number.

20687315 is a deficient number, since it is larger than the sum of its proper divisors (6394333).

20687315 is a wasteful number, since it uses less digits than its factorization.

20687315 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 376149.

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 20687315 is about 4548.3310125803. The cubic root of 20687315 is about 274.5162404141.

The spelling of 20687315 in words is "twenty million, six hundred eighty-seven thousand, three hundred fifteen".