20813228 has 12 divisors (see below), whose sum is σ = 36505392. Its totient is φ = 10383120.

The previous prime is 20813207. The next prime is 20813237. The reversal of 20813228 is 82231802.

It is a junction number, because it is equal to n+sod(n) for n = 20813197 and 20813206.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3800 + ... + 7487.

It is an arithmetic number, because the mean of its divisors is an integer number (3042116).

Almost surely, 2^20813228 is an apocalyptic number.

It is an amenable number.

20813228 is a deficient number, since it is larger than the sum of its proper divisors (15692164).

20813228 is a wasteful number, since it uses less digits than its factorization.

20813228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11752 (or 11750 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 26.

The square root of 20813228 is about 4562.1516853345. The cubic root of 20813228 is about 275.0720604546.

The spelling of 20813228 in words is "twenty million, eight hundred thirteen thousand, two hundred twenty-eight".