18020378 has 8 divisors (see below), whose sum is σ = 27168372. Its totient is φ = 8964256.

The previous prime is 18020351. The next prime is 18020381. The reversal of 18020378 is 87302081.

It can be written as a sum of positive squares in 2 ways, for example, as 17447329 + 573049 = 4177^2 + 757^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 18020378.

It is an unprimeable number.

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, 22475 + ... + 23262.

Almost surely, 2^18020378 is an apocalyptic number.

18020378 is a deficient number, since it is larger than the sum of its proper divisors (9147994).

18020378 is a wasteful number, since it uses less digits than its factorization.

18020378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45936.

The product of its (nonzero) digits is 2688, while the sum is 29.

The square root of 18020378 is about 4245.0415781238. The cubic root of 18020378 is about 262.1730011378.

The spelling of 18020378 in words is "eighteen million, twenty thousand, three hundred seventy-eight".