18520145 has 16 divisors (see below), whose sum is σ = 25488000. Its totient is φ = 12655104.

The previous prime is 18520111. The next prime is 18520147. The reversal of 18520145 is 54102581.

It is not a de Polignac number, because 18520145 - 2¹² = 18516049 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18520147) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11606 + ... + 13104.

It is an arithmetic number, because the mean of its divisors is an integer number (1593000).

Almost surely, 2^18520145 is an apocalyptic number.

It is an amenable number.

18520145 is a deficient number, since it is larger than the sum of its proper divisors (6967855).

18520145 is a wasteful number, since it uses less digits than its factorization.

18520145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1864.

The product of its (nonzero) digits is 1600, while the sum is 26.

The square root of 18520145 is about 4303.5038050407. The cubic root of 18520145 is about 264.5745874032.

The spelling of 18520145 in words is "eighteen million, five hundred twenty thousand, one hundred forty-five".