20571133587 has 4 divisors (see below), whose sum is σ = 27428178120. Its totient is φ = 13714089056.

The previous prime is 20571133567. The next prime is 20571133619. The reversal of 20571133587 is 78533117502.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20571133587 - 2¹⁶ = 20571068051 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20571133547) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3428522262 + ... + 3428522267.

It is an arithmetic number, because the mean of its divisors is an integer number (6857044530).

Almost surely, 2^20571133587 is an apocalyptic number.

20571133587 is a deficient number, since it is larger than the sum of its proper divisors (6857044533).

20571133587 is an equidigital number, since it uses as much as digits as its factorization.

20571133587 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6857044532.

The product of its (nonzero) digits is 176400, while the sum is 42.

The spelling of 20571133587 in words is "twenty billion, five hundred seventy-one million, one hundred thirty-three thousand, five hundred eighty-seven".