20659028 has 12 divisors (see below), whose sum is σ = 38934420. Its totient is φ = 9534912.

The previous prime is 20659021. The next prime is 20659087. The reversal of 20659028 is 82095602.

It can be written as a sum of positive squares in 2 ways, for example, as 7496644 + 13162384 = 2738^2 + 3628^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20658985 and 20659003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20659021) 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, 198593 + ... + 198696.

It is an arithmetic number, because the mean of its divisors is an integer number (3244535).

Almost surely, 2^20659028 is an apocalyptic number.

It is an amenable number.

20659028 is a deficient number, since it is larger than the sum of its proper divisors (18275392).

20659028 is a wasteful number, since it uses less digits than its factorization.

20659028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 397306 (or 397304 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 20659028 is about 4545.2203466939. The cubic root of 20659028 is about 274.3910625314.

The spelling of 20659028 in words is "twenty million, six hundred fifty-nine thousand, twenty-eight".