20941228 has 54 divisors (see below), whose sum is σ = 46911228. Its totient is φ = 8149680.

The previous prime is 20941199. The next prime is 20941231. The reversal of 20941228 is 82214902.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 20941196 and 20941205.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 23275 + ... + 24157.

Almost surely, 2^20941228 is an apocalyptic number.

20941228 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 20941228, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23455614).

20941228 is an abundant number, since it is smaller than the sum of its proper divisors (25970000).

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

20941228 is a wasteful number, since it uses less digits than its factorization.

20941228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 923 (or 903 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 20941228 is about 4576.1586510959. The cubic root of 20941228 is about 275.6348001890.

The spelling of 20941228 in words is "twenty million, nine hundred forty-one thousand, two hundred twenty-eight".