12020 has 12 divisors (see below), whose sum is σ = 25284.
Its totient is φ = 4800.
The previous prime is 12011. The next prime is 12037. The reversal of 12020 is 2021.
Adding to 12020 its reverse (2021), we get a palindrome (14041).
Subtracting from 12020 its reverse (2021), we obtain a palindrome (9999).
It can be written as a sum of positive squares in 2 ways, for example, as 7396 + 4624 = 86^2 + 68^2
It is a Harshad number since it is a multiple of its sum of digits (5).
It is a junction number, because it is equal to n+sod(n) for n = 11995 and 12013.
It is a congruent number.
It is an unprimeable number.
12020 is an untouchable number, because it is not equal to the sum of proper divisors of any number.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 281 + ... + 320.
It is an arithmetic number, because the mean of its divisors is an integer number (2107).
212020 is an apocalyptic number.
12020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.
It is an amenable number.
12020 is an abundant number, since it is smaller than the sum of its proper divisors (13264).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12642).
12020 is a wasteful number, since it uses less digits than its factorization.
12020 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 610 (or 608 counting only the distinct ones).
The product of its (nonzero) digits is 4, while the sum is 5.
The square root of 12020 is about 109.6357605893.
The cubic root of 12020 is about 22.9069968386.
The spelling of 12020 in words is "twelve thousand, twenty", and thus it is an iban number.