20836228 has 48 divisors (see below), whose sum is σ = 43352064. Its totient is φ = 8578080.

The previous prime is 20836223. The next prime is 20836253. The reversal of 20836228 is 82263802.

It is a self number, because there is not a number n which added to its sum of digits gives 20836228.

It is not an unprimeable number, because it can be changed into a prime (20836223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 93325 + ... + 93547.

It is an arithmetic number, because the mean of its divisors is an integer number (903168).

Almost surely, 2^20836228 is an apocalyptic number.

20836228 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20836228, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21676032).

20836228 is an abundant number, since it is smaller than the sum of its proper divisors (22515836).

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

20836228 is a wasteful number, since it uses less digits than its factorization.

20836228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 352 (or 350 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 31.

The square root of 20836228 is about 4564.6717297085. The cubic root of 20836228 is about 275.1733474560.

The spelling of 20836228 in words is "twenty million, eight hundred thirty-six thousand, two hundred twenty-eight".