20842385 has 16 divisors (see below), whose sum is σ = 26376192. Its totient is φ = 15787200.

The previous prime is 20842361. The next prime is 20842397. The reversal of 20842385 is 58324802.

It is not a de Polignac number, because 20842385 - 2¹⁰ = 20841361 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5855 + ... + 8715.

It is an arithmetic number, because the mean of its divisors is an integer number (1648512).

Almost surely, 2^20842385 is an apocalyptic number.

It is an amenable number.

20842385 is a deficient number, since it is larger than the sum of its proper divisors (5533807).

20842385 is a wasteful number, since it uses less digits than its factorization.

20842385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2944.

The product of its (nonzero) digits is 15360, while the sum is 32.

The square root of 20842385 is about 4565.3460985998. The cubic root of 20842385 is about 275.2004488976.

The spelling of 20842385 in words is "twenty million, eight hundred forty-two thousand, three hundred eighty-five".