18220600 has 96 divisors (see below), whose sum is σ = 47005920. Its totient is φ = 6533120.

The previous prime is 18220571. The next prime is 18220607. The reversal of 18220600 is 602281.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18220607) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 78084 + ... + 78316.

It is an arithmetic number, because the mean of its divisors is an integer number (489645).

Almost surely, 2^18220600 is an apocalyptic number.

18220600 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 18220600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23502960).

18220600 is an abundant number, since it is smaller than the sum of its proper divisors (28785320).

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

18220600 is a wasteful number, since it uses less digits than its factorization.

18220600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 289 (or 280 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 18220600 is about 4268.5594759825. The cubic root of 18220600 is about 263.1404166638.

Adding to 18220600 its reverse (602281), we get a palindrome (18822881).

The spelling of 18220600 in words is "eighteen million, two hundred twenty thousand, six hundred".