20155228 has 6 divisors (see below), whose sum is σ = 35271656. Its totient is φ = 10077612.

The previous prime is 20155169. The next prime is 20155249. The reversal of 20155228 is 82255102.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2519400 + ... + 2519407.

Almost surely, 2^20155228 is an apocalyptic number.

It is an amenable number.

20155228 is a deficient number, since it is larger than the sum of its proper divisors (15116428).

20155228 is a wasteful number, since it uses less digits than its factorization.

20155228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5038811 (or 5038809 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 25.

The square root of 20155228 is about 4489.4574282423. The cubic root of 20155228 is about 272.1422086528.

The spelling of 20155228 in words is "twenty million, one hundred fifty-five thousand, two hundred twenty-eight".