123031220 has 24 divisors (see below), whose sum is σ = 278240424. Its totient is φ = 45426816.

The previous prime is 123031217. The next prime is 123031241. The reversal of 123031220 is 22130321.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 22791076 + 100240144 = 4774^2 + 10012^2 .

It is a junction number, because it is equal to n+sod(n) for n = 123031195 and 123031204.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 236339 + ... + 236858.

It is an arithmetic number, because the mean of its divisors is an integer number (11593351).

Almost surely, 2^123031220 is an apocalyptic number.

123031220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123031220 is an abundant number, since it is smaller than the sum of its proper divisors (155209204).

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

123031220 is a wasteful number, since it uses less digits than its factorization.

123031220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 473219 (or 473217 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 123031220 is about 11091.9439234068. The cubic root of 123031220 is about 497.3610564575.

Adding to 123031220 its reverse (22130321), we get a palindrome (145161541).

The spelling of 123031220 in words is "one hundred twenty-three million, thirty-one thousand, two hundred twenty".