20541539 has 4 divisors (see below), whose sum is σ = 20733624. Its totient is φ = 20349456.

The previous prime is 20541523. The next prime is 20541557. The reversal of 20541539 is 93514502.

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 20541539 - 2⁴ = 20541523 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20541739) 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, 95882 + ... + 96095.

It is an arithmetic number, because the mean of its divisors is an integer number (5183406).

Almost surely, 2^20541539 is an apocalyptic number.

20541539 is a deficient number, since it is larger than the sum of its proper divisors (192085).

20541539 is a wasteful number, since it uses less digits than its factorization.

20541539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192084.

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 20541539 is about 4532.2774628215. The cubic root of 20541539 is about 273.8699144516.

The spelling of 20541539 in words is "twenty million, five hundred forty-one thousand, five hundred thirty-nine".