20660235487 has 4 divisors (see below), whose sum is σ = 20864792376. Its totient is φ = 20455678600.

The previous prime is 20660235481. The next prime is 20660235529. The reversal of 20660235487 is 78453206602.

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 20660235487 - 2⁷ = 20660235359 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20660235481) 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, 102278293 + ... + 102278494.

It is an arithmetic number, because the mean of its divisors is an integer number (5216198094).

Almost surely, 2^20660235487 is an apocalyptic number.

20660235487 is a deficient number, since it is larger than the sum of its proper divisors (204556889).

20660235487 is a wasteful number, since it uses less digits than its factorization.

20660235487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204556888.

The product of its (nonzero) digits is 483840, while the sum is 43.

The spelling of 20660235487 in words is "twenty billion, six hundred sixty million, two hundred thirty-five thousand, four hundred eighty-seven".