20385715 has 12 divisors (see below), whose sum is σ = 28457136. Its totient is φ = 13978608.

The previous prime is 20385697. The next prime is 20385719. The reversal of 20385715 is 51758302.

It is not a de Polignac number, because 20385715 - 2⁵ = 20385683 is a prime.

It is a super-2 number, since 2×20385715² = 831154752122450, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20385719) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 41359 + ... + 41848.

It is an arithmetic number, because the mean of its divisors is an integer number (2371428).

Almost surely, 2^20385715 is an apocalyptic number.

20385715 is a deficient number, since it is larger than the sum of its proper divisors (8071421).

20385715 is an equidigital number, since it uses as much as digits as its factorization.

20385715 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83226 (or 83219 counting only the distinct ones).

The product of its (nonzero) digits is 8400, while the sum is 31.

The square root of 20385715 is about 4515.0542632398. The cubic root of 20385715 is about 273.1756485237.

The spelling of 20385715 in words is "twenty million, three hundred eighty-five thousand, seven hundred fifteen".