20161228 has 12 divisors (see below), whose sum is σ = 35478352. Its totient is φ = 10024560.

The previous prime is 20161199. The next prime is 20161237. The reversal of 20161228 is 82216102.

It is a super-2 number, since 2×20161228² = 812950228935968, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20161199 and 20161208.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13200 + ... + 14647.

Almost surely, 2^20161228 is an apocalyptic number.

It is an amenable number.

20161228 is a deficient number, since it is larger than the sum of its proper divisors (15317124).

20161228 is a wasteful number, since it uses less digits than its factorization.

20161228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28032 (or 28030 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 22.

The square root of 20161228 is about 4490.1256107151. The cubic root of 20161228 is about 272.1692106007.

The spelling of 20161228 in words is "twenty million, one hundred sixty-one thousand, two hundred twenty-eight".