20541530599 has 4 divisors (see below), whose sum is σ = 20582369136. Its totient is φ = 20500692064.

The previous prime is 20541530579. The next prime is 20541530701. The reversal of 20541530599 is 99503514502.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20541530599 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 (20541530549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20418514 + ... + 20419519.

It is an arithmetic number, because the mean of its divisors is an integer number (5145592284).

Almost surely, 2^20541530599 is an apocalyptic number.

20541530599 is a deficient number, since it is larger than the sum of its proper divisors (40838537).

20541530599 is an equidigital number, since it uses as much as digits as its factorization.

20541530599 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40838536.

The product of its (nonzero) digits is 243000, while the sum is 43.

The spelling of 20541530599 in words is "twenty billion, five hundred forty-one million, five hundred thirty thousand, five hundred ninety-nine".