20385915 has 16 divisors (see below), whose sum is σ = 35582976. Its totient is φ = 9884000.

The previous prime is 20385887. The next prime is 20385931. The reversal of 20385915 is 51958302.

It is not a de Polignac number, because 20385915 - 2⁶ = 20385851 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 61611 + ... + 61940.

It is an arithmetic number, because the mean of its divisors is an integer number (2223936).

Almost surely, 2^20385915 is an apocalyptic number.

20385915 is a deficient number, since it is larger than the sum of its proper divisors (15197061).

20385915 is a wasteful number, since it uses less digits than its factorization.

20385915 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123570.

The product of its (nonzero) digits is 10800, while the sum is 33.

The square root of 20385915 is about 4515.0764113135. The cubic root of 20385915 is about 273.1765418772.

The spelling of 20385915 in words is "twenty million, three hundred eighty-five thousand, nine hundred fifteen".