20866343 has 2 divisors, whose sum is σ = 20866344. Its totient is φ = 20866342.

The previous prime is 20866337. The next prime is 20866357. The reversal of 20866343 is 34366802.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20866343 - 2¹⁰ = 20865319 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20866303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10433171 + 10433172.

It is an arithmetic number, because the mean of its divisors is an integer number (10433172).

Almost surely, 2^20866343 is an apocalyptic number.

20866343 is a deficient number, since it is larger than the sum of its proper divisors (1).

20866343 is an equidigital number, since it uses as much as digits as its factorization.

20866343 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20736, while the sum is 32.

The square root of 20866343 is about 4567.9692424534. The cubic root of 20866343 is about 275.3058547438.

The spelling of 20866343 in words is "twenty million, eight hundred sixty-six thousand, three hundred forty-three".