20447323 has 4 divisors (see below), whose sum is σ = 22020208. Its totient is φ = 18874440.

The previous prime is 20447293. The next prime is 20447341. The reversal of 20447323 is 32374402.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32374402 = 2 ⋅16187201.

It is a de Polignac number, because none of the positive numbers 2^k-20447323 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20447353) 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, 786423 + ... + 786448.

It is an arithmetic number, because the mean of its divisors is an integer number (5505052).

Almost surely, 2^20447323 is an apocalyptic number.

20447323 is a deficient number, since it is larger than the sum of its proper divisors (1572885).

20447323 is a wasteful number, since it uses less digits than its factorization.

20447323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1572884.

The product of its (nonzero) digits is 4032, while the sum is 25.

The square root of 20447323 is about 4521.8716257762. The cubic root of 20447323 is about 273.4505612896.

The spelling of 20447323 in words is "twenty million, four hundred forty-seven thousand, three hundred twenty-three".