20773823 has 4 divisors (see below), whose sum is σ = 23741520. Its totient is φ = 17806128.

The previous prime is 20773793. The next prime is 20773871. The reversal of 20773823 is 32837702.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20773823 - 2¹⁶ = 20708287 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 20773823.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20773873) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1483838 + ... + 1483851.

It is an arithmetic number, because the mean of its divisors is an integer number (5935380).

Almost surely, 2^20773823 is an apocalyptic number.

20773823 is a deficient number, since it is larger than the sum of its proper divisors (2967697).

20773823 is an equidigital number, since it uses as much as digits as its factorization.

20773823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2967696.

The product of its (nonzero) digits is 14112, while the sum is 32.

The square root of 20773823 is about 4557.8309534251. The cubic root of 20773823 is about 274.8983558238.

The spelling of 20773823 in words is "twenty million, seven hundred seventy-three thousand, eight hundred twenty-three".