18220480 has 56 divisors (see below), whose sum is σ = 43909488. Its totient is φ = 7200768.

The previous prime is 18220469. The next prime is 18220493. The reversal of 18220480 is 8402281.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30747 + ... + 31333.

It is an arithmetic number, because the mean of its divisors is an integer number (784098).

Almost surely, 2^18220480 is an apocalyptic number.

18220480 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 18220480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21954744).

18220480 is an abundant number, since it is smaller than the sum of its proper divisors (25689008).

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

18220480 is an equidigital number, since it uses as much as digits as its factorization.

18220480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 701 (or 691 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 25.

The square root of 18220480 is about 4268.5454196951. The cubic root of 18220480 is about 263.1398389858.

The spelling of 18220480 in words is "eighteen million, two hundred twenty thousand, four hundred eighty".