20210228 has 6 divisors (see below), whose sum is σ = 35367906. Its totient is φ = 10105112.

The previous prime is 20210189. The next prime is 20210237. The reversal of 20210228 is 82201202.

It can be written as a sum of positive squares in only one way, i.e., 19731364 + 478864 = 4442^2 + 692^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2526275 + ... + 2526282.

It is an arithmetic number, because the mean of its divisors is an integer number (5894651).

Almost surely, 2^20210228 is an apocalyptic number.

It is an amenable number.

20210228 is a deficient number, since it is larger than the sum of its proper divisors (15157678).

20210228 is a wasteful number, since it uses less digits than its factorization.

20210228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5052561 (or 5052559 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

The square root of 20210228 is about 4495.5787169173. The cubic root of 20210228 is about 272.3895262428.

The spelling of 20210228 in words is "twenty million, two hundred ten thousand, two hundred twenty-eight".