123131223020 has 48 divisors (see below), whose sum is σ = 281223145728. Its totient is φ = 45013689600.

The previous prime is 123131222971. The next prime is 123131223037. The reversal of 123131223020 is 20322131321.

It is a super-2 number, since 2×123131223020² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 123131222983 and 123131223001.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2318204 + ... + 2370723.

It is an arithmetic number, because the mean of its divisors is an integer number (5858815536).

Almost surely, 2^123131223020 is an apocalyptic number.

123131223020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123131223020 is an abundant number, since it is smaller than the sum of its proper divisors (158091922708).

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

123131223020 is a wasteful number, since it uses less digits than its factorization.

123131223020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4689050 (or 4689048 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 123131223020 its reverse (20322131321), we get a palindrome (143453354341).

The spelling of 123131223020 in words is "one hundred twenty-three billion, one hundred thirty-one million, two hundred twenty-three thousand, twenty".