20146309 has 4 divisors (see below), whose sum is σ = 21331404. Its totient is φ = 18961216.

The previous prime is 20146279. The next prime is 20146319. The reversal of 20146309 is 90364102.

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

It can be written as a sum of positive squares in 2 ways, for example, as 8105409 + 12040900 = 2847^2 + 3470^2 .

It is a cyclic number.

It is not a de Polignac number, because 20146309 - 2⁵ = 20146277 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 (20146319) 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, 592522 + ... + 592555.

It is an arithmetic number, because the mean of its divisors is an integer number (5332851).

Almost surely, 2^20146309 is an apocalyptic number.

It is an amenable number.

20146309 is a deficient number, since it is larger than the sum of its proper divisors (1185095).

20146309 is a wasteful number, since it uses less digits than its factorization.

20146309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1185094.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 20146309 is about 4488.4639911667. The cubic root of 20146309 is about 272.1020603519.

The spelling of 20146309 in words is "twenty million, one hundred forty-six thousand, three hundred nine".