19923361 has 4 divisors (see below), whose sum is σ = 20120724. Its totient is φ = 19726000.

The previous prime is 19923349. The next prime is 19923373. The reversal of 19923361 is 16332991.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16332991 = 43 ⋅379837.

It is an interprime number because it is at equal distance from previous prime (19923349) and next prime (19923373).

It can be written as a sum of positive squares in 2 ways, for example, as 13950225 + 5973136 = 3735^2 + 2444^2 .

It is a cyclic number.

It is not a de Polignac number, because 19923361 - 2¹⁵ = 19890593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19923301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 98530 + ... + 98731.

It is an arithmetic number, because the mean of its divisors is an integer number (5030181).

Almost surely, 2^19923361 is an apocalyptic number.

It is an amenable number.

19923361 is a deficient number, since it is larger than the sum of its proper divisors (197363).

19923361 is a wasteful number, since it uses less digits than its factorization.

19923361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197362.

The product of its digits is 8748, while the sum is 34.

The square root of 19923361 is about 4463.5592300316. The cubic root of 19923361 is about 271.0946007606.

The spelling of 19923361 in words is "nineteen million, nine hundred twenty-three thousand, three hundred sixty-one".