19980085 has 4 divisors (see below), whose sum is σ = 23976108. Its totient is φ = 15984064.

The previous prime is 19980073. The next prime is 19980091. The reversal of 19980085 is 58008991.

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

It can be written as a sum of positive squares in 2 ways, for example, as 15952036 + 4028049 = 3994^2 + 2007^2 .

It is a cyclic number.

It is not a de Polignac number, because 19980085 - 2⁵ = 19980053 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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 3 ways as a sum of consecutive naturals, for example, 1998004 + ... + 1998013.

It is an arithmetic number, because the mean of its divisors is an integer number (5994027).

Almost surely, 2^19980085 is an apocalyptic number.

It is an amenable number.

19980085 is a deficient number, since it is larger than the sum of its proper divisors (3996023).

19980085 is an equidigital number, since it uses as much as digits as its factorization.

19980085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3996022.

The product of its (nonzero) digits is 25920, while the sum is 40.

The square root of 19980085 is about 4469.9088357594. The cubic root of 19980085 is about 271.3516356938.

The spelling of 19980085 in words is "nineteen million, nine hundred eighty thousand, eighty-five".