20180228 has 6 divisors (see below), whose sum is σ = 35315406. Its totient is φ = 10090112.

The previous prime is 20180221. The next prime is 20180231. The reversal of 20180228 is 82208102.

It can be written as a sum of positive squares in only one way, i.e., 14807104 + 5373124 = 3848^2 + 2318^2 .

It is not an unprimeable number, because it can be changed into a prime (20180221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2522525 + ... + 2522532.

It is an arithmetic number, because the mean of its divisors is an integer number (5885901).

Almost surely, 2^20180228 is an apocalyptic number.

It is an amenable number.

20180228 is a deficient number, since it is larger than the sum of its proper divisors (15135178).

20180228 is a wasteful number, since it uses less digits than its factorization.

20180228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5045061 (or 5045059 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 23.

The square root of 20180228 is about 4492.2408662047. The cubic root of 20180228 is about 272.2546814427.

The spelling of 20180228 in words is "twenty million, one hundred eighty thousand, two hundred twenty-eight".