20309169 has 8 divisors (see below), whose sum is σ = 28671840. Its totient is φ = 12742976.

The previous prime is 20309153. The next prime is 20309183. The reversal of 20309169 is 96190302.

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

It is a cyclic number.

It is not a de Polignac number, because 20309169 - 2⁴ = 20309153 is a prime.

It is a super-2 number, since 2×20309169² = 824924690941122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20309129) 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 7 ways as a sum of consecutive naturals, for example, 199059 + ... + 199160.

It is an arithmetic number, because the mean of its divisors is an integer number (3583980).

Almost surely, 2^20309169 is an apocalyptic number.

It is an amenable number.

20309169 is a deficient number, since it is larger than the sum of its proper divisors (8362671).

20309169 is a wasteful number, since it uses less digits than its factorization.

20309169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 398239.

The product of its (nonzero) digits is 2916, while the sum is 30.

The square root of 20309169 is about 4506.5695379080. The cubic root of 20309169 is about 272.8333053666.

The spelling of 20309169 in words is "twenty million, three hundred nine thousand, one hundred sixty-nine".