20395243 has 4 divisors (see below), whose sum is σ = 22249368. Its totient is φ = 18541120.

The previous prime is 20395231. The next prime is 20395283. The reversal of 20395243 is 34259302.

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

It is a cyclic number.

It is not a de Polignac number, because 20395243 - 2¹³ = 20387051 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20395283) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 927046 + ... + 927067.

It is an arithmetic number, because the mean of its divisors is an integer number (5562342).

Almost surely, 2^20395243 is an apocalyptic number.

20395243 is a deficient number, since it is larger than the sum of its proper divisors (1854125).

20395243 is a wasteful number, since it uses less digits than its factorization.

20395243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1854124.

The product of its (nonzero) digits is 6480, while the sum is 28.

The square root of 20395243 is about 4516.1092768001. The cubic root of 20395243 is about 273.2182013959.

The spelling of 20395243 in words is "twenty million, three hundred ninety-five thousand, two hundred forty-three".