18820603 has 2 divisors, whose sum is σ = 18820604. Its totient is φ = 18820602.

The previous prime is 18820591. The next prime is 18820651. The reversal of 18820603 is 30602881.

It is a weak prime.

It is an emirp because it is prime and its reverse (30602881) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18820603 - 2¹³ = 18812411 is a prime.

It is not a weakly prime, because it can be changed into another prime (18820663) 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, 9410301 + 9410302.

It is an arithmetic number, because the mean of its divisors is an integer number (9410302).

Almost surely, 2^18820603 is an apocalyptic number.

18820603 is a deficient number, since it is larger than the sum of its proper divisors (1).

18820603 is an equidigital number, since it uses as much as digits as its factorization.

18820603 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 18820603 is about 4338.2718909723. The cubic root of 18820603 is about 265.9976774441.

The spelling of 18820603 in words is "eighteen million, eight hundred twenty thousand, six hundred three".