20204520487 has 4 divisors (see below), whose sum is σ = 20901228120. Its totient is φ = 19507812856.

The previous prime is 20204520461. The next prime is 20204520509. The reversal of 20204520487 is 78402540202.

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-20204520487 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 (20204520437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 348353773 + ... + 348353830.

It is an arithmetic number, because the mean of its divisors is an integer number (5225307030).

Almost surely, 2^20204520487 is an apocalyptic number.

20204520487 is a deficient number, since it is larger than the sum of its proper divisors (696707633).

20204520487 is an equidigital number, since it uses as much as digits as its factorization.

20204520487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 696707632.

The product of its (nonzero) digits is 35840, while the sum is 34.

The spelling of 20204520487 in words is "twenty billion, two hundred four million, five hundred twenty thousand, four hundred eighty-seven".