12656020 has 24 divisors (see below), whose sum is σ = 28622664. Its totient is φ = 4672896.

The previous prime is 12656011. The next prime is 12656023. The reversal of 12656020 is 2065621.

It can be written as a sum of positive squares in 4 ways, for example, as 293764 + 12362256 = 542^2 + 3516^2 .

It is a junction number, because it is equal to n+sod(n) for n = 12655982 and 12656000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12656023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24079 + ... + 24598.

It is an arithmetic number, because the mean of its divisors is an integer number (1192611).

Almost surely, 2^12656020 is an apocalyptic number.

12656020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12656020 is an abundant number, since it is smaller than the sum of its proper divisors (15966644).

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

12656020 is a wasteful number, since it uses less digits than its factorization.

12656020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48699 (or 48697 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 12656020 is about 3557.5300420376. The cubic root of 12656020 is about 233.0410262570.

The spelling of 12656020 in words is "twelve million, six hundred fifty-six thousand, twenty".