18920361 has 4 divisors (see below), whose sum is σ = 25227152. Its totient is φ = 12613572.

The previous prime is 18920353. The next prime is 18920399. The reversal of 18920361 is 16302981.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 18920361 - 2³ = 18920353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18920761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3153391 + ... + 3153396.

It is an arithmetic number, because the mean of its divisors is an integer number (6306788).

Almost surely, 2^18920361 is an apocalyptic number.

It is an amenable number.

18920361 is a deficient number, since it is larger than the sum of its proper divisors (6306791).

18920361 is an equidigital number, since it uses as much as digits as its factorization.

18920361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6306790.

The product of its (nonzero) digits is 2592, while the sum is 30.

The square root of 18920361 is about 4349.7541309826. The cubic root of 18920361 is about 266.4668202330.

The spelling of 18920361 in words is "eighteen million, nine hundred twenty thousand, three hundred sixty-one".