18480020 has 96 divisors (see below), whose sum is σ = 45849888. Its totient is φ = 6193152.

The previous prime is 18480001. The next prime is 18480029. The reversal of 18480020 is 2008481.

It can be written as a sum of positive squares in 16 ways, for example, as 6061444 + 12418576 = 2462^2 + 3524^2 .

It is a super-3 number, since 3×18480020³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18480029) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 163484 + ... + 163596.

It is an arithmetic number, because the mean of its divisors is an integer number (477603).

Almost surely, 2^18480020 is an apocalyptic number.

18480020 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 18480020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22924944).

18480020 is an abundant number, since it is smaller than the sum of its proper divisors (27369868).

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

18480020 is a wasteful number, since it uses less digits than its factorization.

18480020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189 (or 187 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 23.

The square root of 18480020 is about 4298.8393782508. The cubic root of 18480020 is about 264.3833770332.

The spelling of 18480020 in words is "eighteen million, four hundred eighty thousand, twenty".