123023220 has 96 divisors (see below), whose sum is σ = 377395200. Its totient is φ = 29804544.

The previous prime is 123023183. The next prime is 123023227. The reversal of 123023220 is 22320321.

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 123023220.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123023227) 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, 27501 + ... + 31659.

It is an arithmetic number, because the mean of its divisors is an integer number (3931200).

Almost surely, 2^123023220 is an apocalyptic number.

123023220 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 123023220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (188697600).

123023220 is an abundant number, since it is smaller than the sum of its proper divisors (254371980).

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

123023220 is a wasteful number, since it uses less digits than its factorization.

123023220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4217 (or 4215 counting only the distinct ones).

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

The square root of 123023220 is about 11091.5832954543. The cubic root of 123023220 is about 497.3502760645.

Adding to 123023220 its reverse (22320321), we get a palindrome (145343541).

The spelling of 123023220 in words is "one hundred twenty-three million, twenty-three thousand, two hundred twenty".