123100030020 has 72 divisors (see below), whose sum is σ = 378863255232. Its totient is φ = 29842429760.

The previous prime is 123100030007. The next prime is 123100030087. The reversal of 123100030020 is 20030001321.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 123100029978 and 123100030005.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8470704 + ... + 8485223.

It is an arithmetic number, because the mean of its divisors is an integer number (5261989656).

Almost surely, 2^123100030020 is an apocalyptic number.

123100030020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123100030020 is an abundant number, since it is smaller than the sum of its proper divisors (255763225212).

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

123100030020 is a wasteful number, since it uses less digits than its factorization.

123100030020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16955961 (or 16955948 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 12.

Adding to 123100030020 its reverse (20030001321), we get a palindrome (143130031341).

The spelling of 123100030020 in words is "one hundred twenty-three billion, one hundred million, thirty thousand, twenty".