20912385 has 16 divisors (see below), whose sum is σ = 36033984. Its totient is φ = 10295232.

The previous prime is 20912377. The next prime is 20912417. The reversal of 20912385 is 58321902.

It is a happy number.

It is not a de Polignac number, because 20912385 - 2³ = 20912377 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 53427 + ... + 53816.

It is an arithmetic number, because the mean of its divisors is an integer number (2252124).

Almost surely, 2^20912385 is an apocalyptic number.

It is an amenable number.

20912385 is a deficient number, since it is larger than the sum of its proper divisors (15121599).

20912385 is a wasteful number, since it uses less digits than its factorization.

20912385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107264.

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 20912385 is about 4573.0061228912. The cubic root of 20912385 is about 275.5081952716.

The spelling of 20912385 in words is "twenty million, nine hundred twelve thousand, three hundred eighty-five".