20785228 has 24 divisors (see below), whose sum is σ = 38278800. Its totient is φ = 9860928.

The previous prime is 20785213. The next prime is 20785241. The reversal of 20785228 is 82258702.

It is a junction number, because it is equal to n+sod(n) for n = 20785193 and 20785202.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5326 + ... + 8362.

It is an arithmetic number, because the mean of its divisors is an integer number (1594950).

Almost surely, 2^20785228 is an apocalyptic number.

It is an amenable number.

20785228 is a deficient number, since it is larger than the sum of its proper divisors (17493572).

20785228 is a wasteful number, since it uses less digits than its factorization.

20785228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3129 (or 3127 counting only the distinct ones).

The product of its (nonzero) digits is 17920, while the sum is 34.

The square root of 20785228 is about 4559.0819251248. The cubic root of 20785228 is about 274.9486537744.

The spelling of 20785228 in words is "twenty million, seven hundred eighty-five thousand, two hundred twenty-eight".