18820983 has 4 divisors (see below), whose sum is σ = 25094648. Its totient is φ = 12547320.

The previous prime is 18820973. The next prime is 18820993. The reversal of 18820983 is 38902881.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 38902881 = 3 ⋅12967627.

It is an interprime number because it is at equal distance from previous prime (18820973) and next prime (18820993).

It is not a de Polignac number, because 18820983 - 2¹⁰ = 18819959 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18820943) 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 in 3 ways as a sum of consecutive naturals, for example, 3136828 + ... + 3136833.

It is an arithmetic number, because the mean of its divisors is an integer number (6273662).

Almost surely, 2^18820983 is an apocalyptic number.

18820983 is a deficient number, since it is larger than the sum of its proper divisors (6273665).

18820983 is an equidigital number, since it uses as much as digits as its factorization.

18820983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6273664.

The product of its (nonzero) digits is 27648, while the sum is 39.

The square root of 18820983 is about 4338.3156869919. The cubic root of 18820983 is about 265.9994676530. Note that the first 3 decimals are identical.

The spelling of 18820983 in words is "eighteen million, eight hundred twenty thousand, nine hundred eighty-three".