20326309 has 4 divisors (see below), whose sum is σ = 20338560. Its totient is φ = 20314060.

The previous prime is 20326307. The next prime is 20326343. The reversal of 20326309 is 90362302.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 90362302 = 2 ⋅45181151.

It is a cyclic number.

It is not a de Polignac number, because 20326309 - 2¹ = 20326307 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20326307) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3157 + ... + 7114.

It is an arithmetic number, because the mean of its divisors is an integer number (5084640).

Almost surely, 2^20326309 is an apocalyptic number.

It is an amenable number.

20326309 is a deficient number, since it is larger than the sum of its proper divisors (12251).

20326309 is a wasteful number, since it uses less digits than its factorization.

20326309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12250.

The product of its (nonzero) digits is 1944, while the sum is 25.

The square root of 20326309 is about 4508.4708050513. The cubic root of 20326309 is about 272.9100366848.

The spelling of 20326309 in words is "twenty million, three hundred twenty-six thousand, three hundred nine".