20635828 has 12 divisors (see below), whose sum is σ = 36179332. Its totient is φ = 10298880.

The previous prime is 20635819. The next prime is 20635871. The reversal of 20635828 is 82853602.

It can be written as a sum of positive squares in 2 ways, for example, as 18164644 + 2471184 = 4262^2 + 1572^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20635793 and 20635802.

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, 2163 + ... + 6778.

Almost surely, 2^20635828 is an apocalyptic number.

It is an amenable number.

20635828 is a deficient number, since it is larger than the sum of its proper divisors (15543504).

20635828 is a wasteful number, since it uses less digits than its factorization.

20635828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9522 (or 9520 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 34.

The square root of 20635828 is about 4542.6674982878. The cubic root of 20635828 is about 274.2883107290.

The spelling of 20635828 in words is "twenty million, six hundred thirty-five thousand, eight hundred twenty-eight".