20879385 has 32 divisors (see below), whose sum is σ = 35771520. Its totient is φ = 10368000.

The previous prime is 20879351. The next prime is 20879389. The reversal of 20879385 is 58397802.

It is not a de Polignac number, because 20879385 - 2⁶ = 20879321 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20879389) 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, 16785 + ... + 17985.

It is an arithmetic number, because the mean of its divisors is an integer number (1117860).

Almost surely, 2^20879385 is an apocalyptic number.

It is an amenable number.

20879385 is a deficient number, since it is larger than the sum of its proper divisors (14892135).

20879385 is a wasteful number, since it uses less digits than its factorization.

20879385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1289.

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

The square root of 20879385 is about 4569.3965684760. The cubic root of 20879385 is about 275.3632005400.

The spelling of 20879385 in words is "twenty million, eight hundred seventy-nine thousand, three hundred eighty-five".