20870539 has 4 divisors (see below), whose sum is σ = 21077280. Its totient is φ = 20663800.

The previous prime is 20870513. The next prime is 20870573. The reversal of 20870539 is 93507802.

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 20870539 - 2¹⁹ = 20346251 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20870639) 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, 103219 + ... + 103420.

It is an arithmetic number, because the mean of its divisors is an integer number (5269320).

Almost surely, 2^20870539 is an apocalyptic number.

20870539 is a deficient number, since it is larger than the sum of its proper divisors (206741).

20870539 is a wasteful number, since it uses less digits than its factorization.

20870539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206740.

The product of its (nonzero) digits is 15120, while the sum is 34.

The square root of 20870539 is about 4568.4285044203. The cubic root of 20870539 is about 275.3243072017.

The spelling of 20870539 in words is "twenty million, eight hundred seventy thousand, five hundred thirty-nine".