20123329 has 4 divisors (see below), whose sum is σ = 20330884. Its totient is φ = 19915776.

The previous prime is 20123293. The next prime is 20123339. The reversal of 20123329 is 92332102.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 92332102 = 2 ⋅46166051.

It can be written as a sum of positive squares in 2 ways, for example, as 7535025 + 12588304 = 2745^2 + 3548^2 .

It is a cyclic number.

It is not a de Polignac number, because 20123329 - 2¹¹ = 20121281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20123339) 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 3 ways as a sum of consecutive naturals, for example, 103632 + ... + 103825.

It is an arithmetic number, because the mean of its divisors is an integer number (5082721).

Almost surely, 2^20123329 is an apocalyptic number.

It is an amenable number.

20123329 is a deficient number, since it is larger than the sum of its proper divisors (207555).

20123329 is an equidigital number, since it uses as much as digits as its factorization.

20123329 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207554.

The product of its (nonzero) digits is 648, while the sum is 22.

The square root of 20123329 is about 4485.9033649868. The cubic root of 20123329 is about 271.9985627447.

The spelling of 20123329 in words is "twenty million, one hundred twenty-three thousand, three hundred twenty-nine".