111553220 has 48 divisors (see below), whose sum is σ = 245887488. Its totient is φ = 42430080.

The previous prime is 111553219. The next prime is 111553249. The reversal of 111553220 is 22355111.

It is a happy number.

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 = 111553192 and 111553201.

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, 90005 + ... + 91235.

It is an arithmetic number, because the mean of its divisors is an integer number (5122656).

Almost surely, 2^111553220 is an apocalyptic number.

111553220 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 111553220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (122943744).

111553220 is an abundant number, since it is smaller than the sum of its proper divisors (134334268).

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

111553220 is a wasteful number, since it uses less digits than its factorization.

111553220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1460 (or 1458 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 20.

The square root of 111553220 is about 10561.8757803716. The cubic root of 111553220 is about 481.3866442812.

The spelling of 111553220 in words is "one hundred eleven million, five hundred fifty-three thousand, two hundred twenty".