20436228 has 18 divisors (see below), whose sum is σ = 51658334. Its totient is φ = 6812064.

The previous prime is 20436209. The next prime is 20436233. The reversal of 20436228 is 82263402.

20436228 is a `hidden beast` number, since 2 + 0 + 436 + 228 = 666.

It can be written as a sum of positive squares in only one way, i.e., 18818244 + 1617984 = 4338^2 + 1272^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 283801 + ... + 283872.

Almost surely, 2^20436228 is an apocalyptic number.

It is an amenable number.

20436228 is an abundant number, since it is smaller than the sum of its proper divisors (31222106).

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

20436228 is a wasteful number, since it uses less digits than its factorization.

20436228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 567683 (or 567678 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

The square root of 20436228 is about 4520.6446442958. The cubic root of 20436228 is about 273.4010929901.

The spelling of 20436228 in words is "twenty million, four hundred thirty-six thousand, two hundred twenty-eight".