12533420 has 48 divisors (see below), whose sum is σ = 28159488. Its totient is φ = 4669440.

The previous prime is 12533377. The next prime is 12533441. The reversal of 12533420 is 2433521.

It is a happy number.

12533420 is nontrivially palindromic in base 9.

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 = 12533392 and 12533401.

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, 64844 + ... + 65036.

It is an arithmetic number, because the mean of its divisors is an integer number (586656).

Almost surely, 2^12533420 is an apocalyptic number.

12533420 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 12533420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14079744).

12533420 is an abundant number, since it is smaller than the sum of its proper divisors (15626068).

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

12533420 is a wasteful number, since it uses less digits than its factorization.

12533420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 410 (or 408 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 12533420 is about 3540.2570528141. The cubic root of 12533420 is about 232.2860868262.

Adding to 12533420 its reverse (2433521), we get a palindrome (14966941).

The spelling of 12533420 in words is "twelve million, five hundred thirty-three thousand, four hundred twenty".