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12109220 = 2253119531
BaseRepresentation
bin101110001100…
…010110100100
3211210012201122
4232030112210
511044443340
61111313112
7204632564
oct56142644
924705648
1012109220
116920922
12407b798
13267c926
141872da4
1510e2db5
hexb8c5a4

12109220 has 24 divisors (see below), whose sum is σ = 26251008. Its totient is φ = 4687200.

The previous prime is 12109217. The next prime is 12109231. The reversal of 12109220 is 2290121.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9146 + ... + 10385.

It is an arithmetic number, because the mean of its divisors is an integer number (1093792).

Almost surely, 212109220 is an apocalyptic number.

12109220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12109220 is an abundant number, since it is smaller than the sum of its proper divisors (14141788).

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

12109220 is a wasteful number, since it uses less digits than its factorization.

12109220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19571 (or 19569 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 12109220 is about 3479.8304556400. The cubic root of 12109220 is about 229.6353389660.

Adding to 12109220 its reverse (2290121), we get a palindrome (14399341).

The spelling of 12109220 in words is "twelve million, one hundred nine thousand, two hundred twenty".

Divisors: 1 2 4 5 10 20 31 62 124 155 310 620 19531 39062 78124 97655 195310 390620 605461 1210922 2421844 3027305 6054610 12109220