20885228 has 48 divisors (see below), whose sum is σ = 45374784. Its totient is φ = 8190720.

The previous prime is 20885213. The next prime is 20885243. The reversal of 20885228 is 82258802.

It is an interprime number because it is at equal distance from previous prime (20885213) and next prime (20885243).

It is a super-2 number, since 2×20885228² = 872385497223968, which contains 22 as substring.

It is a nialpdrome in base 13.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 65726 + ... + 66042.

It is an arithmetic number, because the mean of its divisors is an integer number (945308).

Almost surely, 2^20885228 is an apocalyptic number.

20885228 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 20885228, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22687392).

20885228 is an abundant number, since it is smaller than the sum of its proper divisors (24489556).

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

20885228 is a wasteful number, since it uses less digits than its factorization.

20885228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 522 (or 520 counting only the distinct ones).

The product of its (nonzero) digits is 20480, while the sum is 35.

The square root of 20885228 is about 4570.0358860735. The cubic root of 20885228 is about 275.3888845200.

The spelling of 20885228 in words is "twenty million, eight hundred eighty-five thousand, two hundred twenty-eight".