20079309 has 16 divisors (see below), whose sum is σ = 27480384. Its totient is φ = 13036800.

The previous prime is 20079259. The next prime is 20079313. The reversal of 20079309 is 90397002.

It is not a de Polignac number, because 20079309 - 2¹² = 20075213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20079109) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20194 + ... + 21164.

It is an arithmetic number, because the mean of its divisors is an integer number (1717524).

Almost surely, 2^20079309 is an apocalyptic number.

It is an amenable number.

20079309 is a deficient number, since it is larger than the sum of its proper divisors (7401075).

20079309 is a wasteful number, since it uses less digits than its factorization.

20079309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1148.

The product of its (nonzero) digits is 3402, while the sum is 30.

The square root of 20079309 is about 4480.9941977200. The cubic root of 20079309 is about 271.8000846833.

The spelling of 20079309 in words is "twenty million, seventy-nine thousand, three hundred nine".