12123020 has 48 divisors (see below), whose sum is σ = 31338048. Its totient is φ = 3836160.

The previous prime is 12123019. The next prime is 12123029. The reversal of 12123020 is 2032121.

12123020 = 1313² + 1314² + ... + 1319².

It is a happy number.

It is a super-2 number, since 2×12123020² = 293935227840800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12122992 and 12123010.

It is not an unprimeable number, because it can be changed into a prime (12123029) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1511 + ... + 5150.

It is an arithmetic number, because the mean of its divisors is an integer number (652876).

Almost surely, 2^12123020 is an apocalyptic number.

12123020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12123020 is an abundant number, since it is smaller than the sum of its proper divisors (19215028).

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

12123020 is a wasteful number, since it uses less digits than its factorization.

12123020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6690 (or 6688 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 12123020 is about 3481.8127462573. The cubic root of 12123020 is about 229.7225387643.

Adding to 12123020 its reverse (2032121), we get a palindrome (14155141).

The spelling of 12123020 in words is "twelve million, one hundred twenty-three thousand, twenty".