20618361687 has 16 divisors (see below), whose sum is σ = 34274679552. Its totient is φ = 10710837120.

The previous prime is 20618361679. The next prime is 20618361691. The reversal of 20618361687 is 78616381602.

It is not a de Polignac number, because 20618361687 - 2³ = 20618361679 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20618361607) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44628258 + ... + 44628719.

It is an arithmetic number, because the mean of its divisors is an integer number (2142167472).

Almost surely, 2^20618361687 is an apocalyptic number.

20618361687 is a deficient number, since it is larger than the sum of its proper divisors (13656317865).

20618361687 is a wasteful number, since it uses less digits than its factorization.

20618361687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89256998.

The product of its (nonzero) digits is 580608, while the sum is 48.

The spelling of 20618361687 in words is "twenty billion, six hundred eighteen million, three hundred sixty-one thousand, six hundred eighty-seven".