123320220 has 24 divisors (see below), whose sum is σ = 345296784. Its totient is φ = 32885376.

The previous prime is 123320213. The next prime is 123320221. The reversal of 123320220 is 22023321.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 123320220.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123320221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1027609 + ... + 1027728.

It is an arithmetic number, because the mean of its divisors is an integer number (14387366).

Almost surely, 2^123320220 is an apocalyptic number.

123320220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123320220 is an abundant number, since it is smaller than the sum of its proper divisors (221976564).

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

123320220 is a wasteful number, since it uses less digits than its factorization.

123320220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2055349 (or 2055347 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 15.

The square root of 123320220 is about 11104.9637550061. The cubic root of 123320220 is about 497.7501851837.

Adding to 123320220 its reverse (22023321), we get a palindrome (145343541).

The spelling of 123320220 in words is "one hundred twenty-three million, three hundred twenty thousand, two hundred twenty".