20964360587 has 4 divisors (see below), whose sum is σ = 21229732320. Its totient is φ = 20698988856.

The previous prime is 20964360583. The next prime is 20964360631. The reversal of 20964360587 is 78506346902.

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 20964360587 - 2² = 20964360583 is a prime.

It is a deceptive number, since it divides R_20964360586.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20964360583) 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, 132685748 + ... + 132685905.

It is an arithmetic number, because the mean of its divisors is an integer number (5307433080).

Almost surely, 2^20964360587 is an apocalyptic number.

20964360587 is a deficient number, since it is larger than the sum of its proper divisors (265371733).

20964360587 is an equidigital number, since it uses as much as digits as its factorization.

20964360587 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 265371732.

The product of its (nonzero) digits is 2177280, while the sum is 50.

The spelling of 20964360587 in words is "twenty billion, nine hundred sixty-four million, three hundred sixty thousand, five hundred eighty-seven".