20385879 has 32 divisors (see below), whose sum is σ = 30105600. Its totient is φ = 12221280.

The previous prime is 20385851. The next prime is 20385887. The reversal of 20385879 is 97858302.

It is not a de Polignac number, because 20385879 - 2⁹ = 20385367 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20385879.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20385179) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 146592 + ... + 146730.

It is an arithmetic number, because the mean of its divisors is an integer number (940800).

Almost surely, 2^20385879 is an apocalyptic number.

20385879 is a deficient number, since it is larger than the sum of its proper divisors (9719721).

20385879 is a wasteful number, since it uses less digits than its factorization.

20385879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275.

The product of its (nonzero) digits is 120960, while the sum is 42.

The square root of 20385879 is about 4515.0724246683. The cubic root of 20385879 is about 273.1763810740.

The spelling of 20385879 in words is "twenty million, three hundred eighty-five thousand, eight hundred seventy-nine".