20863228 has 12 divisors (see below), whose sum is σ = 36604512. Its totient is φ = 10404800.

The previous prime is 20863207. The next prime is 20863229. The reversal of 20863228 is 82236802.

It is a self number, because there is not a number n which added to its sum of digits gives 20863228.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20863229) 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, 4900 + ... + 8107.

It is an arithmetic number, because the mean of its divisors is an integer number (3050376).

Almost surely, 2^20863228 is an apocalyptic number.

20863228 is the 2442-nd centered heptagonal number.

It is an amenable number.

20863228 is a deficient number, since it is larger than the sum of its proper divisors (15741284).

20863228 is a wasteful number, since it uses less digits than its factorization.

20863228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13412 (or 13410 counting only the distinct ones).

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

The square root of 20863228 is about 4567.6282685875. The cubic root of 20863228 is about 275.2921545247.

It can be divided in two parts, 208 and 63228, that added together give a palindrome (63436).

The spelling of 20863228 in words is "twenty million, eight hundred sixty-three thousand, two hundred twenty-eight".