20525543461 has 4 divisors (see below), whose sum is σ = 20550484192. Its totient is φ = 20500602732.

The previous prime is 20525543447. The next prime is 20525543473. The reversal of 20525543461 is 16434552502.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20525543461 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20525543461.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20525543491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12469131 + ... + 12470776.

It is an arithmetic number, because the mean of its divisors is an integer number (5137621048).

Almost surely, 2^20525543461 is an apocalyptic number.

It is an amenable number.

20525543461 is a deficient number, since it is larger than the sum of its proper divisors (24940731).

20525543461 is an equidigital number, since it uses as much as digits as its factorization.

20525543461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24940730.

The product of its (nonzero) digits is 144000, while the sum is 37.

The spelling of 20525543461 in words is "twenty billion, five hundred twenty-five million, five hundred forty-three thousand, four hundred sixty-one".