120203550 has 144 divisors (see below), whose sum is σ = 341808480. Its totient is φ = 30240000.

The previous prime is 120203539. The next prime is 120203599. The reversal of 120203550 is 55302021.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 795975 + ... + 796125.

It is an arithmetic number, because the mean of its divisors is an integer number (2373670).

Almost surely, 2^120203550 is an apocalyptic number.

120203550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 120203550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (170904240).

120203550 is an abundant number, since it is smaller than the sum of its proper divisors (221604930).

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

120203550 is a wasteful number, since it uses less digits than its factorization.

120203550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 259 (or 251 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 18.

The square root of 120203550 is about 10963.7379574669. The cubic root of 120203550 is about 493.5211448090.

Adding to 120203550 its reverse (55302021), we get a palindrome (175505571).

The spelling of 120203550 in words is "one hundred twenty million, two hundred three thousand, five hundred fifty".