18303020 has 48 divisors (see below), whose sum is σ = 40497408. Its totient is φ = 6938880.

The previous prime is 18303001. The next prime is 18303037. The reversal of 18303020 is 2030381.

It is a super-2 number, since 2×18303020² = 670001082240800, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18303020.

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, 32582 + ... + 33138.

It is an arithmetic number, because the mean of its divisors is an integer number (843696).

Almost surely, 2^18303020 is an apocalyptic number.

18303020 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 18303020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20248704).

18303020 is an abundant number, since it is smaller than the sum of its proper divisors (22194388).

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

18303020 is a wasteful number, since it uses less digits than its factorization.

18303020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 650 (or 648 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 18303020 is about 4278.2028937394. The cubic root of 18303020 is about 263.5365875452.

The spelling of 18303020 in words is "eighteen million, three hundred three thousand, twenty".