20804028 has 36 divisors (see below), whose sum is σ = 56469672. Its totient is φ = 5943840.

The previous prime is 20803987. The next prime is 20804053. The reversal of 20804028 is 82040802.

It is a junction number, because it is equal to n+sod(n) for n = 20803989 and 20804007.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17103 + ... + 18278.

It is an arithmetic number, because the mean of its divisors is an integer number (1568602).

Almost surely, 2^20804028 is an apocalyptic number.

20804028 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

20804028 is an abundant number, since it is smaller than the sum of its proper divisors (35665644).

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

20804028 is a wasteful number, since it uses less digits than its factorization.

20804028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35402 (or 35393 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 24.

The square root of 20804028 is about 4561.1432777320. The cubic root of 20804028 is about 275.0315247607.

The spelling of 20804028 in words is "twenty million, eight hundred four thousand, twenty-eight".