19980205 has 16 divisors (see below), whose sum is σ = 27921024. Its totient is φ = 13440960.

The previous prime is 19980187. The next prime is 19980211. The reversal of 19980205 is 50208991.

It is not a de Polignac number, because 19980205 - 2⁹ = 19979693 is a prime.

It is a Duffinian number.

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, 3531 + ... + 7240.

It is an arithmetic number, because the mean of its divisors is an integer number (1745064).

Almost surely, 2^19980205 is an apocalyptic number.

It is an amenable number.

19980205 is a deficient number, since it is larger than the sum of its proper divisors (7940819).

19980205 is a wasteful number, since it uses less digits than its factorization.

19980205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10836.

The product of its (nonzero) digits is 6480, while the sum is 34.

The square root of 19980205 is about 4469.9222588318. The cubic root of 19980205 is about 271.3521789370.

The spelling of 19980205 in words is "nineteen million, nine hundred eighty thousand, two hundred five".