12205720 has 16 divisors (see below), whose sum is σ = 27462960. Its totient is φ = 4882272.

The previous prime is 12205691. The next prime is 12205747. The reversal of 12205720 is 2750221.

It is a plaindrome in base 15.

It is a zygodrome in base 6.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 152532 + ... + 152611.

It is an arithmetic number, because the mean of its divisors is an integer number (1716435).

Almost surely, 2^12205720 is an apocalyptic number.

12205720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12205720 is an abundant number, since it is smaller than the sum of its proper divisors (15257240).

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

12205720 is a wasteful number, since it uses less digits than its factorization.

12205720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 305154 (or 305150 counting only the distinct ones).

The product of its (nonzero) digits is 280, while the sum is 19.

The square root of 12205720 is about 3493.6685589792. The cubic root of 12205720 is about 230.2437239985.

Adding to 12205720 its reverse (2750221), we get a palindrome (14955941).

The spelling of 12205720 in words is "twelve million, two hundred five thousand, seven hundred twenty".