20530001987 has 8 divisors (see below), whose sum is σ = 23168654640. Its totient is φ = 18020064160.

The previous prime is 20530001983. The next prime is 20530002013. The reversal of 20530001987 is 78910003502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20530001987 - 2² = 20530001983 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20530001983) 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 7 ways as a sum of consecutive naturals, for example, 32178368 + ... + 32179005.

It is an arithmetic number, because the mean of its divisors is an integer number (2896081830).

Almost surely, 2^20530001987 is an apocalyptic number.

20530001987 is a deficient number, since it is larger than the sum of its proper divisors (2638652653).

20530001987 is a wasteful number, since it uses less digits than its factorization.

20530001987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64357413.

The product of its (nonzero) digits is 15120, while the sum is 35.

The spelling of 20530001987 in words is "twenty billion, five hundred thirty million, one thousand, nine hundred eighty-seven".