20071587 has 8 divisors (see below), whose sum is σ = 27008080. Its totient is φ = 13258080.

The previous prime is 20071573. The next prime is 20071603. The reversal of 20071587 is 78517002.

It is a happy number.

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

It is not a de Polignac number, because 20071587 - 2¹⁰ = 20070563 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20071517) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30364 + ... + 31017.

It is an arithmetic number, because the mean of its divisors is an integer number (3376010).

Almost surely, 2^20071587 is an apocalyptic number.

20071587 is a deficient number, since it is larger than the sum of its proper divisors (6936493).

20071587 is a wasteful number, since it uses less digits than its factorization.

20071587 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61493.

The product of its (nonzero) digits is 3920, while the sum is 30.

The square root of 20071587 is about 4480.1324757199. The cubic root of 20071587 is about 271.7652377111.

Adding to 20071587 its reverse (78517002), we get a palindrome (98588589).

The spelling of 20071587 in words is "twenty million, seventy-one thousand, five hundred eighty-seven".