20597948587 has 4 divisors (see below), whose sum is σ = 20599840800. Its totient is φ = 20596056376.

The previous prime is 20597948573. The next prime is 20597948597. The reversal of 20597948587 is 78584979502.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78584979502 = 2 ⋅39292489751.

It is a cyclic number.

It is not a de Polignac number, because 20597948587 - 2¹⁹ = 20597424299 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20597948557) 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 3 ways as a sum of consecutive naturals, for example, 929683 + ... + 951580.

It is an arithmetic number, because the mean of its divisors is an integer number (5149960200).

Almost surely, 2^20597948587 is an apocalyptic number.

20597948587 is a deficient number, since it is larger than the sum of its proper divisors (1892213).

20597948587 is a wasteful number, since it uses less digits than its factorization.

20597948587 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1892212.

The product of its (nonzero) digits is 50803200, while the sum is 64.

The spelling of 20597948587 in words is "twenty billion, five hundred ninety-seven million, nine hundred forty-eight thousand, five hundred eighty-seven".