20538315 has 48 divisors (see below), whose sum is σ = 41116608. Its totient is φ = 9289728.

The previous prime is 20538307. The next prime is 20538317. The reversal of 20538315 is 51383502.

It is not a de Polignac number, because 20538315 - 2³ = 20538307 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20538317) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 35307 + ... + 35883.

It is an arithmetic number, because the mean of its divisors is an integer number (856596).

Almost surely, 2^20538315 is an apocalyptic number.

20538315 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

20538315 is a wasteful number, since it uses less digits than its factorization.

20538315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 708 (or 705 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 20538315 is about 4531.9217777892. The cubic root of 20538315 is about 273.8555857167.

The spelling of 20538315 in words is "twenty million, five hundred thirty-eight thousand, three hundred fifteen".