19904228 has 6 divisors (see below), whose sum is σ = 34832406. Its totient is φ = 9952112.

The previous prime is 19904221. The next prime is 19904233. The reversal of 19904228 is 82240991.

It can be written as a sum of positive squares in only one way, i.e., 18939904 + 964324 = 4352^2 + 982^2 .

It is not an unprimeable number, because it can be changed into a prime (19904221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2488025 + ... + 2488032.

It is an arithmetic number, because the mean of its divisors is an integer number (5805401).

Almost surely, 2^19904228 is an apocalyptic number.

It is an amenable number.

19904228 is a deficient number, since it is larger than the sum of its proper divisors (14928178).

19904228 is a wasteful number, since it uses less digits than its factorization.

19904228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4976061 (or 4976059 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 19904228 is about 4461.4154704533. The cubic root of 19904228 is about 271.0077928797.

The spelling of 19904228 in words is "nineteen million, nine hundred four thousand, two hundred twenty-eight".