19668793 has 4 divisors (see below), whose sum is σ = 20200420. Its totient is φ = 19137168.

The previous prime is 19668791. The next prime is 19668799. The reversal of 19668793 is 39786691.

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 11648569 + 8020224 = 3413^2 + 2832^2 .

It is a cyclic number.

It is not a de Polignac number, because 19668793 - 2¹ = 19668791 is a prime.

It is a super-2 number, since 2×19668793² = 773722836153698, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19668791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 265758 + ... + 265831.

It is an arithmetic number, because the mean of its divisors is an integer number (5050105).

Almost surely, 2^19668793 is an apocalyptic number.

It is an amenable number.

19668793 is a deficient number, since it is larger than the sum of its proper divisors (531627).

19668793 is an equidigital number, since it uses as much as digits as its factorization.

19668793 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 531626.

The product of its digits is 489888, while the sum is 49.

The square root of 19668793 is about 4434.9512962376. The cubic root of 19668793 is about 269.9350232303.

The spelling of 19668793 in words is "nineteen million, six hundred sixty-eight thousand, seven hundred ninety-three".