20689228 has 24 divisors (see below), whose sum is σ = 41479424. Its totient is φ = 8845200.

The previous prime is 20689217. The next prime is 20689237. The reversal of 20689228 is 82298602.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17083 + ... + 18253.

Almost surely, 2^20689228 is an apocalyptic number.

20689228 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

20689228 is an abundant number, since it is smaller than the sum of its proper divisors (20790196).

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

20689228 is a wasteful number, since it uses less digits than its factorization.

20689228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1813 (or 1811 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 37.

The square root of 20689228 is about 4548.5413046382. The cubic root of 20689228 is about 274.5247018535.

The spelling of 20689228 in words is "twenty million, six hundred eighty-nine thousand, two hundred twenty-eight".