18820563 has 8 divisors (see below), whose sum is σ = 25376400. Its totient is φ = 12405888.

The previous prime is 18820553. The next prime is 18820573. The reversal of 18820563 is 36502881.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (18820553) and next prime (18820573).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18820563 - 2¹⁶ = 18755027 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18820553) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34978 + ... + 35511.

It is an arithmetic number, because the mean of its divisors is an integer number (3172050).

Almost surely, 2^18820563 is an apocalyptic number.

18820563 is a deficient number, since it is larger than the sum of its proper divisors (6555837).

18820563 is an equidigital number, since it uses as much as digits as its factorization.

18820563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70581.

The product of its (nonzero) digits is 11520, while the sum is 33.

The square root of 18820563 is about 4338.2672808392. The cubic root of 18820563 is about 265.9974889996.

The spelling of 18820563 in words is "eighteen million, eight hundred twenty thousand, five hundred sixty-three".