123235220 has 12 divisors (see below), whose sum is σ = 258794004. Its totient is φ = 49294080.

The previous prime is 123235213. The next prime is 123235243. The reversal of 123235220 is 22532321.

It can be written as a sum of positive squares in 2 ways, for example, as 95335696 + 27899524 = 9764^2 + 5282^2 .

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 6161761 = 123235220 / (1 + 2 + 3 + 2 + 3 + 5 + 2 + 2 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 123235192 and 123235201.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3080861 + ... + 3080900.

It is an arithmetic number, because the mean of its divisors is an integer number (21566167).

Almost surely, 2^123235220 is an apocalyptic number.

123235220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123235220 is an abundant number, since it is smaller than the sum of its proper divisors (135558784).

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

123235220 is a wasteful number, since it uses less digits than its factorization.

123235220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6161770 (or 6161768 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 123235220 is about 11101.1359779078. The cubic root of 123235220 is about 497.6357987241.

Adding to 123235220 its reverse (22532321), we get a palindrome (145767541).

The spelling of 123235220 in words is "one hundred twenty-three million, two hundred thirty-five thousand, two hundred twenty".