115331220 has 72 divisors (see below), whose sum is σ = 359313864. Its totient is φ = 29922048.

The previous prime is 115331207. The next prime is 115331243. The reversal of 115331220 is 22133511.

115331220 is a `hidden beast` number, since 11 + 533 + 122 + 0 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 52794756 + 62536464 = 7266^2 + 7908^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 115331193 and 115331202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1999 + ... + 15318.

Almost surely, 2^115331220 is an apocalyptic number.

115331220 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 115331220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (179656932).

115331220 is an abundant number, since it is smaller than the sum of its proper divisors (243982644).

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

115331220 is a wasteful number, since it uses less digits than its factorization.

115331220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17369 (or 17364 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 18.

The square root of 115331220 is about 10739.2374030934. The cubic root of 115331220 is about 486.7608364298.

Adding to 115331220 its reverse (22133511), we get a palindrome (137464731).

The spelling of 115331220 in words is "one hundred fifteen million, three hundred thirty-one thousand, two hundred twenty".