19801828 has 12 divisors (see below), whose sum is σ = 34711600. Its totient is φ = 9884232.

The previous prime is 19801823. The next prime is 19801861. The reversal of 19801828 is 82810891.

It is a super-2 number, since 2×19801828² = 784224784283168, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (19801823) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1278 + ... + 6421.

Almost surely, 2^19801828 is an apocalyptic number.

It is an amenable number.

19801828 is a deficient number, since it is larger than the sum of its proper divisors (14909772).

19801828 is a wasteful number, since it uses less digits than its factorization.

19801828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8346 (or 8344 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 37.

The square root of 19801828 is about 4449.9244937414. The cubic root of 19801828 is about 270.5422481654.

The spelling of 19801828 in words is "nineteen million, eight hundred one thousand, eight hundred twenty-eight".