20840228 has 6 divisors (see below), whose sum is σ = 36470406. Its totient is φ = 10420112.

The previous prime is 20840173. The next prime is 20840233. The reversal of 20840228 is 82204802.

It can be written as a sum of positive squares in only one way, i.e., 17123044 + 3717184 = 4138^2 + 1928^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20840197 and 20840206.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2605025 + ... + 2605032.

It is an arithmetic number, because the mean of its divisors is an integer number (6078401).

Almost surely, 2^20840228 is an apocalyptic number.

It is an amenable number.

20840228 is a deficient number, since it is larger than the sum of its proper divisors (15630178).

20840228 is a wasteful number, since it uses less digits than its factorization.

20840228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5210061 (or 5210059 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 26.

The square root of 20840228 is about 4565.1098562904. The cubic root of 20840228 is about 275.1909549770.

The spelling of 20840228 in words is "twenty million, eight hundred forty thousand, two hundred twenty-eight".