20156228 has 12 divisors (see below), whose sum is σ = 35320320. Its totient is φ = 10064712.

The previous prime is 20156219. The next prime is 20156243. The reversal of 20156228 is 82265102.

It is a junction number, because it is equal to n+sod(n) for n = 20156197 and 20156206.

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, 533 + ... + 6371.

It is an arithmetic number, because the mean of its divisors is an integer number (2943360).

Almost surely, 2^20156228 is an apocalyptic number.

It is an amenable number.

20156228 is a deficient number, since it is larger than the sum of its proper divisors (15164092).

20156228 is a wasteful number, since it uses less digits than its factorization.

20156228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6706 (or 6704 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 20156228 is about 4489.5687988937. The cubic root of 20156228 is about 272.1467093496.

The spelling of 20156228 in words is "twenty million, one hundred fifty-six thousand, two hundred twenty-eight".