11731220 has 48 divisors (see below), whose sum is σ = 25740288. Its totient is φ = 4487040.

The previous prime is 11731211. The next prime is 11731243. The reversal of 11731220 is 2213711.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61325 + ... + 61515.

It is an arithmetic number, because the mean of its divisors is an integer number (536256).

Almost surely, 2^11731220 is an apocalyptic number.

11731220 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 11731220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12870144).

11731220 is an abundant number, since it is smaller than the sum of its proper divisors (14009068).

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

11731220 is a wasteful number, since it uses less digits than its factorization.

11731220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320 (or 318 counting only the distinct ones).

The product of its (nonzero) digits is 84, while the sum is 17.

The square root of 11731220 is about 3425.0868602125. The cubic root of 11731220 is about 227.2206126326.

Adding to 11731220 its reverse (2213711), we get a palindrome (13944931).

The spelling of 11731220 in words is "eleven million, seven hundred thirty-one thousand, two hundred twenty".