123100020 has 96 divisors (see below), whose sum is σ = 384733440. Its totient is φ = 32676480.

The previous prime is 123099997. The next prime is 123100051. The reversal of 123100020 is 20001321.

It is a happy number.

It is a super-2 number, since 2×123100020² = 30307229848000800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 123099975 and 123100011.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 167574 + ... + 168306.

It is an arithmetic number, because the mean of its divisors is an integer number (4007640).

Almost surely, 2^123100020 is an apocalyptic number.

123100020 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 123100020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (192366720).

123100020 is an abundant number, since it is smaller than the sum of its proper divisors (261633420).

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

123100020 is a wasteful number, since it uses less digits than its factorization.

123100020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1062 (or 1054 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

The square root of 123100020 is about 11095.0448399274. The cubic root of 123100020 is about 497.4537485516.

Adding to 123100020 its reverse (20001321), we get a palindrome (143101341).

The spelling of 123100020 in words is "one hundred twenty-three million, one hundred thousand, twenty".