18520830 has 48 divisors (see below), whose sum is σ = 48831120. Its totient is φ = 4869504.

The previous prime is 18520829. The next prime is 18520841. The reversal of 18520830 is 3802581.

It is a happy number.

It is a super-2 number, since 2×18520830² = 686042287777800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18520794 and 18520803.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5161 + ... + 7979.

It is an arithmetic number, because the mean of its divisors is an integer number (1017315).

Almost surely, 2^18520830 is an apocalyptic number.

18520830 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 18520830, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24415560).

18520830 is an abundant number, since it is smaller than the sum of its proper divisors (30310290).

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

18520830 is a wasteful number, since it uses less digits than its factorization.

18520830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2905 (or 2902 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 18520830 is about 4303.5833906176. The cubic root of 18520830 is about 264.5778492811.

The spelling of 18520830 in words is "eighteen million, five hundred twenty thousand, eight hundred thirty".