20884399 has 2 divisors, whose sum is σ = 20884400. Its totient is φ = 20884398.

The previous prime is 20884393. The next prime is 20884427. The reversal of 20884399 is 99348802.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20884399 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20884393) 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 as a sum of consecutive naturals, namely, 10442199 + 10442200.

It is an arithmetic number, because the mean of its divisors is an integer number (10442200).

Almost surely, 2^20884399 is an apocalyptic number.

20884399 is a deficient number, since it is larger than the sum of its proper divisors (1).

20884399 is an equidigital number, since it uses as much as digits as its factorization.

20884399 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 124416, while the sum is 43.

The square root of 20884399 is about 4569.9451856669. The cubic root of 20884399 is about 275.3852407898.

The spelling of 20884399 in words is "twenty million, eight hundred eighty-four thousand, three hundred ninety-nine".