18820145 has 8 divisors (see below), whose sum is σ = 22692480. Its totient is φ = 14983920.

The previous prime is 18820129. The next prime is 18820169. The reversal of 18820145 is 54102881.

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

It is not a de Polignac number, because 18820145 - 2⁴ = 18820129 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7865 + ... + 9974.

It is an arithmetic number, because the mean of its divisors is an integer number (2836560).

Almost surely, 2^18820145 is an apocalyptic number.

It is an amenable number.

18820145 is a deficient number, since it is larger than the sum of its proper divisors (3872335).

18820145 is a wasteful number, since it uses less digits than its factorization.

18820145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18055.

The product of its (nonzero) digits is 2560, while the sum is 29.

The square root of 18820145 is about 4338.2191046557. The cubic root of 18820145 is about 265.9955197391.

The spelling of 18820145 in words is "eighteen million, eight hundred twenty thousand, one hundred forty-five".