20915228 has 12 divisors (see below), whose sum is σ = 36714552. Its totient is φ = 10425360.

The previous prime is 20915227. The next prime is 20915233. The reversal of 20915228 is 82251902.

It is a self number, because there is not a number n which added to its sum of digits gives 20915228.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20915227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6575 + ... + 9222.

It is an arithmetic number, because the mean of its divisors is an integer number (3059546).

Almost surely, 2^20915228 is an apocalyptic number.

It is an amenable number.

20915228 is a deficient number, since it is larger than the sum of its proper divisors (15799324).

20915228 is a wasteful number, since it uses less digits than its factorization.

20915228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16132 (or 16130 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 20915228 is about 4573.3169581825. The cubic root of 20915228 is about 275.5206796488.

The spelling of 20915228 in words is "twenty million, nine hundred fifteen thousand, two hundred twenty-eight".