20840827 has 24 divisors (see below), whose sum is σ = 26002944. Its totient is φ = 16595712.

The previous prime is 20840789. The next prime is 20840837. The reversal of 20840827 is 72804802.

It is not a de Polignac number, because 20840827 - 2¹⁹ = 20316539 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20840837) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 105693 + ... + 105889.

It is an arithmetic number, because the mean of its divisors is an integer number (1083456).

Almost surely, 2^20840827 is an apocalyptic number.

20840827 is a deficient number, since it is larger than the sum of its proper divisors (5162117).

20840827 is a wasteful number, since it uses less digits than its factorization.

20840827 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 355 (or 348 counting only the distinct ones).

The product of its (nonzero) digits is 7168, while the sum is 31.

The square root of 20840827 is about 4565.1754621263. The cubic root of 20840827 is about 275.1935915093.

The spelling of 20840827 in words is "twenty million, eight hundred forty thousand, eight hundred twenty-seven".