20655228 has 48 divisors (see below), whose sum is σ = 52948224. Its totient is φ = 6215040.

The previous prime is 20655227. The next prime is 20655241. The reversal of 20655228 is 82255602.

It is a junction number, because it is equal to n+sod(n) for n = 20655195 and 20655204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20655227) 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, 21576 + ... + 22512.

It is an arithmetic number, because the mean of its divisors is an integer number (1103088).

Almost surely, 2^20655228 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20655228, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26474112).

20655228 is an abundant number, since it is smaller than the sum of its proper divisors (32292996).

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

20655228 is a wasteful number, since it uses less digits than its factorization.

20655228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1122 (or 1120 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 30.

The square root of 20655228 is about 4544.8023059315. The cubic root of 20655228 is about 274.3742377647.

The spelling of 20655228 in words is "twenty million, six hundred fifty-five thousand, two hundred twenty-eight".