20818363 has 2 divisors, whose sum is σ = 20818364. Its totient is φ = 20818362.

The previous prime is 20818361. The next prime is 20818373. The reversal of 20818363 is 36381802.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20818363 - 2¹ = 20818361 is a prime.

Together with 20818361, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (20818361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10409181 + 10409182.

It is an arithmetic number, because the mean of its divisors is an integer number (10409182).

Almost surely, 2^20818363 is an apocalyptic number.

20818363 is a deficient number, since it is larger than the sum of its proper divisors (1).

20818363 is an equidigital number, since it uses as much as digits as its factorization.

20818363 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 20818363 is about 4562.7144333171. The cubic root of 20818363 is about 275.0946803462.

The spelling of 20818363 in words is "twenty million, eight hundred eighteen thousand, three hundred sixty-three".