18720153 has 20 divisors (see below), whose sum is σ = 28110720. Its totient is φ = 12415032.

The previous prime is 18720083. The next prime is 18720173. The reversal of 18720153 is 35102781.

It is not a de Polignac number, because 18720153 - 2²¹ = 16623001 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (18720173) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 18876 + ... + 19842.

It is an arithmetic number, because the mean of its divisors is an integer number (1405536).

It is a vampire number, since it can be written as 2151 ⋅ 8703 (with its own digits).

Almost surely, 2^18720153 is an apocalyptic number.

It is an amenable number.

18720153 is a deficient number, since it is larger than the sum of its proper divisors (9390567).

18720153 is an equidigital number, since it uses as much as digits as its factorization.

18720153 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1218 (or 1209 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 27.

The square root of 18720153 is about 4326.6792115894. The cubic root of 18720153 is about 265.5236022300.

The spelling of 18720153 in words is "eighteen million, seven hundred twenty thousand, one hundred fifty-three".