20805028 has 12 divisors (see below), whose sum is σ = 36539440. Its totient is φ = 10365192.

The previous prime is 20805017. The next prime is 20805047. The reversal of 20805028 is 82050802.

It is a junction number, because it is equal to n+sod(n) for n = 20804993 and 20805011.

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, 8058 + ... + 10321.

Almost surely, 2^20805028 is an apocalyptic number.

It is an amenable number.

20805028 is a deficient number, since it is larger than the sum of its proper divisors (15734412).

20805028 is a wasteful number, since it uses less digits than its factorization.

20805028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18666 (or 18664 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 25.

The square root of 20805028 is about 4561.2528980533. The cubic root of 20805028 is about 275.0359313932.

The spelling of 20805028 in words is "twenty million, eight hundred five thousand, twenty-eight".