20808028 has 12 divisors (see below), whose sum is σ = 37189152. Its totient is φ = 10182560.

The previous prime is 20808019. The next prime is 20808071. The reversal of 20808028 is 82080802.

It is a junction number, because it is equal to n+sod(n) for n = 20807987 and 20808005.

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, 55153 + ... + 55528.

It is an arithmetic number, because the mean of its divisors is an integer number (3099096).

Almost surely, 2^20808028 is an apocalyptic number.

It is an amenable number.

20808028 is a deficient number, since it is larger than the sum of its proper divisors (16381124).

20808028 is a wasteful number, since it uses less digits than its factorization.

20808028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110732 (or 110730 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 28.

The square root of 20808028 is about 4561.5817432114. The cubic root of 20808028 is about 275.0491504435.

The spelling of 20808028 in words is "twenty million, eight hundred eight thousand, twenty-eight".