12201720 has 32 divisors (see below), whose sum is σ = 36605520. Its totient is φ = 3253760.

The previous prime is 12201719. The next prime is 12201737. The reversal of 12201720 is 2710221.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 12201720.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50721 + ... + 50960.

Almost surely, 2^12201720 is an apocalyptic number.

12201720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12201720 is an abundant number, since it is smaller than the sum of its proper divisors (24403800).

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

12201720 is a wasteful number, since it uses less digits than its factorization.

12201720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101695 (or 101691 counting only the distinct ones).

The product of its (nonzero) digits is 56, while the sum is 15.

The square root of 12201720 is about 3493.0960479208. The cubic root of 12201720 is about 230.2185697943.

Adding to 12201720 its reverse (2710221), we get a palindrome (14911941).

It can be divided in two parts, 12201 and 720, that added together give a palindrome (12921).

The spelling of 12201720 in words is "twelve million, two hundred one thousand, seven hundred twenty".