19999828 has 6 divisors (see below), whose sum is σ = 34999706. Its totient is φ = 9999912.

The previous prime is 19999817. The next prime is 19999831. The reversal of 19999828 is 82899991.

It can be written as a sum of positive squares in only one way, i.e., 17960644 + 2039184 = 4238^2 + 1428^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2499975 + ... + 2499982.

Almost surely, 2^19999828 is an apocalyptic number.

It is an amenable number.

19999828 is a deficient number, since it is larger than the sum of its proper divisors (14999878).

19999828 is a wasteful number, since it uses less digits than its factorization.

19999828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4999961 (or 4999959 counting only the distinct ones).

The product of its digits is 839808, while the sum is 55.

The square root of 19999828 is about 4472.1167247736. The cubic root of 19999828 is about 271.4409835242.

The spelling of 19999828 in words is "nineteen million, nine hundred ninety-nine thousand, eight hundred twenty-eight".