20820028 has 12 divisors (see below), whose sum is σ = 37691640. Its totient is φ = 10050992.

The previous prime is 20820017. The next prime is 20820047. The reversal of 20820028 is 82002802.

It is a junction number, because it is equal to n+sod(n) for n = 20819990 and 20820008.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 89626 + ... + 89857.

It is an arithmetic number, because the mean of its divisors is an integer number (3140970).

Almost surely, 2^20820028 is an apocalyptic number.

It is an amenable number.

20820028 is a deficient number, since it is larger than the sum of its proper divisors (16871612).

20820028 is a wasteful number, since it uses less digits than its factorization.

20820028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179516 (or 179514 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 22.

The square root of 20820028 is about 4562.8968868472. The cubic root of 20820028 is about 275.1020139429.

The spelling of 20820028 in words is "twenty million, eight hundred twenty thousand, twenty-eight".