20964287 has 2 divisors, whose sum is σ = 20964288. Its totient is φ = 20964286.

The previous prime is 20964283. The next prime is 20964331. The reversal of 20964287 is 78246902.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20964287 - 2² = 20964283 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20964287.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20964283) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10482143 + 10482144.

It is an arithmetic number, because the mean of its divisors is an integer number (10482144).

Almost surely, 2^20964287 is an apocalyptic number.

20964287 is a deficient number, since it is larger than the sum of its proper divisors (1).

20964287 is an equidigital number, since it uses as much as digits as its factorization.

20964287 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48384, while the sum is 38.

The square root of 20964287 is about 4578.6774291273. The cubic root of 20964287 is about 275.7359329308.

The spelling of 20964287 in words is "twenty million, nine hundred sixty-four thousand, two hundred eighty-seven".