20840885 has 16 divisors (see below), whose sum is σ = 27264384. Its totient is φ = 15200832.

The previous prime is 20840873. The next prime is 20840887. The reversal of 20840885 is 58804802.

It is a cyclic number.

It is not a de Polignac number, because 20840885 - 2¹⁴ = 20824501 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20840887) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3464 + ... + 7326.

It is an arithmetic number, because the mean of its divisors is an integer number (1704024).

Almost surely, 2^20840885 is an apocalyptic number.

It is an amenable number.

20840885 is a deficient number, since it is larger than the sum of its proper divisors (6423499).

20840885 is a wasteful number, since it uses less digits than its factorization.

20840885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3964.

The product of its (nonzero) digits is 20480, while the sum is 35.

The square root of 20840885 is about 4565.1818145612. The cubic root of 20840885 is about 275.1938467969.

The spelling of 20840885 in words is "twenty million, eight hundred forty thousand, eight hundred eighty-five".