18145320 has 64 divisors (see below), whose sum is σ = 55080000. Its totient is φ = 4781568.

The previous prime is 18145319. The next prime is 18145327. The reversal of 18145320 is 2354181.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (18145327) 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, 9831 + ... + 11529.

It is an arithmetic number, because the mean of its divisors is an integer number (860625).

Almost surely, 2^18145320 is an apocalyptic number.

18145320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18145320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27540000).

18145320 is an abundant number, since it is smaller than the sum of its proper divisors (36934680).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18145320 is a wasteful number, since it uses less digits than its factorization.

18145320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1802 (or 1798 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 18145320 is about 4259.7323859604. The cubic root of 18145320 is about 262.7775205550. Note that the first 3 decimals are identical.

The spelling of 18145320 in words is "eighteen million, one hundred forty-five thousand, three hundred twenty".