18020520 has 96 divisors (see below), whose sum is σ = 66942720. Its totient is φ = 4118400.

The previous prime is 18020503. The next prime is 18020537. The reversal of 18020520 is 2502081.

It is an interprime number because it is at equal distance from previous prime (18020503) and next prime (18020537).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 18020493 and 18020502.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1056 + ... + 6095.

It is an arithmetic number, because the mean of its divisors is an integer number (697320).

Almost surely, 2^18020520 is an apocalyptic number.

18020520 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 18020520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33471360).

18020520 is an abundant number, since it is smaller than the sum of its proper divisors (48922200).

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

18020520 is a wasteful number, since it uses less digits than its factorization.

18020520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7175 (or 7168 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 18020520 is about 4245.0583034865. The cubic root of 18020520 is about 262.1736897743.

The spelling of 18020520 in words is "eighteen million, twenty thousand, five hundred twenty".