20541530591 has 16 divisors (see below), whose sum is σ = 21897000960. Its totient is φ = 19214560800.

The previous prime is 20541530579. The next prime is 20541530701. The reversal of 20541530591 is 19503514502.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20541530591 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 (20541530551) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 689690 + ... + 718856.

It is an arithmetic number, because the mean of its divisors is an integer number (1368562560).

Almost surely, 2^20541530591 is an apocalyptic number.

20541530591 is a deficient number, since it is larger than the sum of its proper divisors (1355470369).

20541530591 is a wasteful number, since it uses less digits than its factorization.

20541530591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29654.

The product of its (nonzero) digits is 27000, while the sum is 35.

The spelling of 20541530591 in words is "twenty billion, five hundred forty-one million, five hundred thirty thousand, five hundred ninety-one".