19958065 has 4 divisors (see below), whose sum is σ = 23949684. Its totient is φ = 15966448.

The previous prime is 19958053. The next prime is 19958069. The reversal of 19958065 is 56085991.

It is a happy number.

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 2217121 + 17740944 = 1489^2 + 4212^2 .

It is a cyclic number.

It is not a de Polignac number, because 19958065 - 2¹³ = 19949873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19958069) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1995802 + ... + 1995811.

It is an arithmetic number, because the mean of its divisors is an integer number (5987421).

Almost surely, 2^19958065 is an apocalyptic number.

It is an amenable number.

19958065 is a deficient number, since it is larger than the sum of its proper divisors (3991619).

19958065 is an equidigital number, since it uses as much as digits as its factorization.

19958065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3991618.

The product of its (nonzero) digits is 97200, while the sum is 43.

The square root of 19958065 is about 4467.4450192476. The cubic root of 19958065 is about 271.2519137385.

The spelling of 19958065 in words is "nineteen million, nine hundred fifty-eight thousand, sixty-five".