12203820 has 72 divisors (see below), whose sum is σ = 37346400. Its totient is φ = 3225600.

The previous prime is 12203803. The next prime is 12203831. The reversal of 12203820 is 2830221.

It is a happy number.

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 = 12203793 and 12203802.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 26956 + ... + 27404.

It is an arithmetic number, because the mean of its divisors is an integer number (518700).

Almost surely, 2^12203820 is an apocalyptic number.

12203820 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 12203820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18673200).

12203820 is an abundant number, since it is smaller than the sum of its proper divisors (25142580).

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

12203820 is a wasteful number, since it uses less digits than its factorization.

12203820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 615 (or 610 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 12203820 is about 3493.3966279253. The cubic root of 12203820 is about 230.2317764369.

The spelling of 12203820 in words is "twelve million, two hundred three thousand, eight hundred twenty".