115720220 has 96 divisors (see below), whose sum is σ = 305496576. Its totient is φ = 35769600.

The previous prime is 115720183. The next prime is 115720223. The reversal of 115720220 is 22027511.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 115720192 and 115720201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (115720223) 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, 250790 + ... + 251250.

It is an arithmetic number, because the mean of its divisors is an integer number (3182256).

Almost surely, 2^115720220 is an apocalyptic number.

115720220 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 115720220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (152748288).

115720220 is an abundant number, since it is smaller than the sum of its proper divisors (189776356).

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

115720220 is a wasteful number, since it uses less digits than its factorization.

115720220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 651 (or 649 counting only the distinct ones).

The product of its (nonzero) digits is 280, while the sum is 20.

The square root of 115720220 is about 10757.3333126756. Note that the first 4 decimals coincide. The cubic root of 115720220 is about 487.3074865551.

Adding to 115720220 its reverse (22027511), we get a palindrome (137747731).

The spelling of 115720220 in words is "one hundred fifteen million, seven hundred twenty thousand, two hundred twenty".