20660828 has 12 divisors (see below), whose sum is σ = 38059560. Its totient is φ = 9786672.

The previous prime is 20660813. The next prime is 20660839. The reversal of 20660828 is 82806602.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 20660794 and 20660803.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 135851 + ... + 136002.

It is an arithmetic number, because the mean of its divisors is an integer number (3171630).

Almost surely, 2^20660828 is an apocalyptic number.

It is an amenable number.

20660828 is a deficient number, since it is larger than the sum of its proper divisors (17398732).

20660828 is a wasteful number, since it uses less digits than its factorization.

20660828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 271876 (or 271874 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 20660828 is about 4545.4183525832. The cubic root of 20660828 is about 274.3990314376.

The spelling of 20660828 in words is "twenty million, six hundred sixty thousand, eight hundred twenty-eight".