20827807 has 16 divisors (see below), whose sum is σ = 27965952. Its totient is φ = 14980320.

The previous prime is 20827799. The next prime is 20827813. The reversal of 20827807 is 70872802.

It is a cyclic number.

It is not a de Polignac number, because 20827807 - 2³ = 20827799 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20827837) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9403 + ... + 11404.

It is an arithmetic number, because the mean of its divisors is an integer number (1747872).

Almost surely, 2^20827807 is an apocalyptic number.

20827807 is a deficient number, since it is larger than the sum of its proper divisors (7138145).

20827807 is a wasteful number, since it uses less digits than its factorization.

20827807 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20838.

The product of its (nonzero) digits is 12544, while the sum is 34.

The square root of 20827807 is about 4563.7492262393. The cubic root of 20827807 is about 275.1362718554.

It can be divided in two parts, 2082 and 7807, that added together give a palindrome (9889).

The spelling of 20827807 in words is "twenty million, eight hundred twenty-seven thousand, eight hundred seven".