11115720 has 192 divisors, whose sum is σ = 45152640. Its totient is φ = 2304000.

The previous prime is 11115719. The next prime is 11115737. The reversal of 11115720 is 2751111.

It is a happy number.

It is a super-2 number, since 2×11115720² = 247118462236800, which contains 22 as substring.

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

It is a nialpdrome in base 15.

It is a junction number, because it is equal to n+sod(n) for n = 11115693 and 11115702.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 27520 + ... + 27920.

It is an arithmetic number, because the mean of its divisors is an integer number (235170).

Almost surely, 2^11115720 is an apocalyptic number.

11115720 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 11115720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22576320).

11115720 is an abundant number, since it is smaller than the sum of its proper divisors (34036920).

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

11115720 is a wasteful number, since it uses less digits than its factorization.

11115720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 436 (or 429 counting only the distinct ones).

The product of its (nonzero) digits is 70, while the sum is 18.

The square root of 11115720 is about 3334.0245949903. The cubic root of 11115720 is about 223.1751658499.

Adding to 11115720 its reverse (2751111), we get a palindrome (13866831).

The spelling of 11115720 in words is "eleven million, one hundred fifteen thousand, seven hundred twenty".