18220560 has 120 divisors (see below), whose sum is σ = 59103360. Its totient is φ = 4642560.

The previous prime is 18220513. The next prime is 18220561. The reversal of 18220560 is 6502281.

It is a tau number, because it is divible by the number of its divisors (120).

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

It is a self number, because there is not a number n which added to its sum of digits gives 18220560.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18220561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 230601 + ... + 230679.

It is an arithmetic number, because the mean of its divisors is an integer number (492528).

Almost surely, 2^18220560 is an apocalyptic number.

18220560 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 18220560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29551680).

18220560 is an abundant number, since it is smaller than the sum of its proper divisors (40882800).

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

18220560 is a wasteful number, since it uses less digits than its factorization.

18220560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157 (or 120 counting only the distinct ones).

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

The square root of 18220560 is about 4268.5547905585. The cubic root of 18220560 is about 263.1402241047.

The spelling of 18220560 in words is "eighteen million, two hundred twenty thousand, five hundred sixty".