Search a number
-
+
12021220 = 225601061
BaseRepresentation
bin101101110110…
…110111100100
3211121202000101
4231312313210
511034134340
61105353444
7204115201
oct55666744
924552011
1012021220
1168707a2
124038884
13264b863
14184cca8
1510c6c9a
hexb76de4

12021220 has 12 divisors (see below), whose sum is σ = 25244604. Its totient is φ = 4808480.

The previous prime is 12021187. The next prime is 12021259. The reversal of 12021220 is 2212021.

It can be written as a sum of positive squares in 2 ways, for example, as 5271616 + 6749604 = 2296^2 + 2598^2 .

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 12021197 and 12021206.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 300511 + ... + 300550.

It is an arithmetic number, because the mean of its divisors is an integer number (2103717).

Almost surely, 212021220 is an apocalyptic number.

12021220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12021220 is an abundant number, since it is smaller than the sum of its proper divisors (13223384).

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

12021220 is a wasteful number, since it uses less digits than its factorization.

12021220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 601070 (or 601068 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 12021220 is about 3467.1631054798. The cubic root of 12021220 is about 229.0777181339.

Adding to 12021220 its reverse (2212021), we get a palindrome (14233241).

The spelling of 12021220 in words is "twelve million, twenty-one thousand, two hundred twenty".

Divisors: 1 2 4 5 10 20 601061 1202122 2404244 3005305 6010610 12021220