12280820 has 12 divisors (see below), whose sum is σ = 25789764. Its totient is φ = 4912320.

The previous prime is 12280813. The next prime is 12280823. The reversal of 12280820 is 2808221.

It can be written as a sum of positive squares in 2 ways, for example, as 7862416 + 4418404 = 2804^2 + 2102^2 .

It is a hoax number, since the sum of its digits (23) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12280823) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 307001 + ... + 307040.

It is an arithmetic number, because the mean of its divisors is an integer number (2149147).

Almost surely, 2^12280820 is an apocalyptic number.

12280820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12280820 is an abundant number, since it is smaller than the sum of its proper divisors (13508944).

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

12280820 is a wasteful number, since it uses less digits than its factorization.

12280820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 614050 (or 614048 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 23.

The square root of 12280820 is about 3504.4000913138. The cubic root of 12280820 is about 230.7149773886.

The spelling of 12280820 in words is "twelve million, two hundred eighty thousand, eight hundred twenty".