18920663 has 2 divisors, whose sum is σ = 18920664. Its totient is φ = 18920662.

The previous prime is 18920641. The next prime is 18920701. The reversal of 18920663 is 36602981.

It is a weak prime.

It is an emirp because it is prime and its reverse (36602981) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18920663 - 2¹⁴ = 18904279 is a 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 (18920563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9460331 + 9460332.

It is an arithmetic number, because the mean of its divisors is an integer number (9460332).

Almost surely, 2^18920663 is an apocalyptic number.

18920663 is a deficient number, since it is larger than the sum of its proper divisors (1).

18920663 is an equidigital number, since it uses as much as digits as its factorization.

18920663 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 18920663 is about 4349.7888454499. The cubic root of 18920663 is about 266.4682379746.

The spelling of 18920663 in words is "eighteen million, nine hundred twenty thousand, six hundred sixty-three".