11720280 has 128 divisors (see below), whose sum is σ = 41368320. Its totient is φ = 2618880.

The previous prime is 11720257. The next prime is 11720281. The reversal of 11720280 is 8202711.

11720280 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11720281) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16819 + ... + 17501.

It is an arithmetic number, because the mean of its divisors is an integer number (323190).

Almost surely, 2^11720280 is an apocalyptic number.

11720280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11720280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20684160).

11720280 is an abundant number, since it is smaller than the sum of its proper divisors (29648040).

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

11720280 is a wasteful number, since it uses less digits than its factorization.

11720280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 721 (or 717 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 21.

The square root of 11720280 is about 3423.4894479171. The cubic root of 11720280 is about 227.1499588099.

Adding to 11720280 its reverse (8202711), we get a palindrome (19922991).

The spelling of 11720280 in words is "eleven million, seven hundred twenty thousand, two hundred eighty".