19820398 has 32 divisors (see below), whose sum is σ = 33586560. Its totient is φ = 8709120.

The previous prime is 19820387. The next prime is 19820407. The reversal of 19820398 is 89302891.

It is a self number, because there is not a number n which added to its sum of digits gives 19820398.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 73003 + ... + 73273.

It is an arithmetic number, because the mean of its divisors is an integer number (1049580).

Almost surely, 2^19820398 is an apocalyptic number.

19820398 is a deficient number, since it is larger than the sum of its proper divisors (13766162).

19820398 is a wasteful number, since it uses less digits than its factorization.

19820398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 412.

The product of its (nonzero) digits is 31104, while the sum is 40.

The square root of 19820398 is about 4452.0105570405. The cubic root of 19820398 is about 270.6267925466.

The spelling of 19820398 in words is "nineteen million, eight hundred twenty thousand, three hundred ninety-eight".