19820128 has 24 divisors (see below), whose sum is σ = 39336192. Its totient is φ = 9830016.

The previous prime is 19820117. The next prime is 19820153. The reversal of 19820128 is 82102891.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 19820128.

It is a congruent number.

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, 1626 + ... + 6502.

It is an arithmetic number, because the mean of its divisors is an integer number (1639008).

Almost surely, 2^19820128 is an apocalyptic number.

It is an amenable number.

19820128 is a deficient number, since it is larger than the sum of its proper divisors (19516064).

19820128 is a wasteful number, since it uses less digits than its factorization.

19820128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5014 (or 5006 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 31.

The square root of 19820128 is about 4451.9802335590. The cubic root of 19820128 is about 270.6255636852.

The spelling of 19820128 in words is "nineteen million, eight hundred twenty thousand, one hundred twenty-eight".