20500228 has 18 divisors (see below), whose sum is σ = 41733006. Its totient is φ = 8785728.

The previous prime is 20500223. The next prime is 20500229. The reversal of 20500228 is 82200502.

It can be written as a sum of positive squares in only one way, i.e., 17288964 + 3211264 = 4158^2 + 1792^2 .

It is not an unprimeable number, because it can be changed into a prime (20500223) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 52101 + ... + 52492.

Almost surely, 2^20500228 is an apocalyptic number.

20500228 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

20500228 is an abundant number, since it is smaller than the sum of its proper divisors (21232778).

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

20500228 is a wasteful number, since it uses less digits than its factorization.

20500228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104611 (or 104602 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 20500228 is about 4527.7177473866. The cubic root of 20500228 is about 273.6861983739.

The spelling of 20500228 in words is "twenty million, five hundred thousand, two hundred twenty-eight".