18576220 has 48 divisors (see below), whose sum is σ = 43168608. Its totient is φ = 6670080.

The previous prime is 18576197. The next prime is 18576253. The reversal of 18576220 is 2267581.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8655 + ... + 10585.

It is an arithmetic number, because the mean of its divisors is an integer number (899346).

Almost surely, 2^18576220 is an apocalyptic number.

18576220 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 18576220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21584304).

18576220 is an abundant number, since it is smaller than the sum of its proper divisors (24592388).

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

18576220 is a wasteful number, since it uses less digits than its factorization.

18576220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1990 (or 1988 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 31.

The square root of 18576220 is about 4310.0139210912. The cubic root of 18576220 is about 264.8413432647.

The spelling of 18576220 in words is "eighteen million, five hundred seventy-six thousand, two hundred twenty".