12005220 has 24 divisors (see below), whose sum is σ = 33614784. Its totient is φ = 3201376.

The previous prime is 12005219. The next prime is 12005221. The reversal of 12005220 is 2250021.

It is an interprime number because it is at equal distance from previous prime (12005219) and next prime (12005221).

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 12005196 and 12005205.

It is not an unprimeable number, because it can be changed into a prime (12005221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 99984 + ... + 100103.

It is an arithmetic number, because the mean of its divisors is an integer number (1400616).

Almost surely, 2^12005220 is an apocalyptic number.

12005220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12005220 is an abundant number, since it is smaller than the sum of its proper divisors (21609564).

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

12005220 is a wasteful number, since it uses less digits than its factorization.

12005220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200099 (or 200097 counting only the distinct ones).

The product of its (nonzero) digits is 40, while the sum is 12.

The square root of 12005220 is about 3464.8549753200. The cubic root of 12005220 is about 228.9760404113.

Adding to 12005220 its reverse (2250021), we get a palindrome (14255241).

The spelling of 12005220 in words is "twelve million, five thousand, two hundred twenty".