19820360899 has 4 divisors (see below), whose sum is σ = 19820699536. Its totient is φ = 19820022264.

The previous prime is 19820360881. The next prime is 19820360933. The reversal of 19820360899 is 99806302891.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 19820360899 - 2¹¹ = 19820358851 is a prime.

It is a deceptive number, since it divides R_19820360898.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19820360839) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56439 + ... + 206944.

It is an arithmetic number, because the mean of its divisors is an integer number (4955174884).

Almost surely, 2^19820360899 is an apocalyptic number.

19820360899 is the 75253-rd nonagonal number.

19820360899 is a deficient number, since it is larger than the sum of its proper divisors (338637).

19820360899 is an equidigital number, since it uses as much as digits as its factorization.

19820360899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 338636.

The product of its (nonzero) digits is 1679616, while the sum is 55.

The spelling of 19820360899 in words is "nineteen billion, eight hundred twenty million, three hundred sixty thousand, eight hundred ninety-nine".