20385707 has 4 divisors (see below), whose sum is σ = 20458536. Its totient is φ = 20312880.

The previous prime is 20385697. The next prime is 20385719. The reversal of 20385707 is 70758302.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 70758302 = 2 ⋅35379151.

It is a cyclic number.

It is not a de Polignac number, because 20385707 - 2¹⁶ = 20320171 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20381707) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35993 + ... + 36554.

It is an arithmetic number, because the mean of its divisors is an integer number (5114634).

Almost surely, 2^20385707 is an apocalyptic number.

20385707 is a deficient number, since it is larger than the sum of its proper divisors (72829).

20385707 is an equidigital number, since it uses as much as digits as its factorization.

20385707 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72828.

The product of its (nonzero) digits is 11760, while the sum is 32.

The square root of 20385707 is about 4515.0533773146. The cubic root of 20385707 is about 273.1756127894.

The spelling of 20385707 in words is "twenty million, three hundred eighty-five thousand, seven hundred seven".