20191323 has 8 divisors (see below), whose sum is σ = 27790336. Its totient is φ = 13026600.

The previous prime is 20191277. The next prime is 20191333. The reversal of 20191323 is 32319102.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20191323 - 2⁹ = 20190811 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20191323.

It is not an unprimeable number, because it can be changed into a prime (20191333) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 108463 + ... + 108648.

It is an arithmetic number, because the mean of its divisors is an integer number (3473792).

Almost surely, 2^20191323 is an apocalyptic number.

20191323 is a deficient number, since it is larger than the sum of its proper divisors (7599013).

20191323 is a wasteful number, since it uses less digits than its factorization.

20191323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217145.

The product of its (nonzero) digits is 324, while the sum is 21.

The square root of 20191323 is about 4493.4756035835. The cubic root of 20191323 is about 272.3045671076.

The spelling of 20191323 in words is "twenty million, one hundred ninety-one thousand, three hundred twenty-three".