20727818685 has 48 divisors (see below), whose sum is σ = 42015752064. Its totient is φ = 9255206016.

The previous prime is 20727818681. The next prime is 20727818723. The reversal of 20727818685 is 58681872702.

It is not a de Polignac number, because 20727818685 - 2² = 20727818681 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20727818681) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 751602 + ... + 778691.

It is an arithmetic number, because the mean of its divisors is an integer number (875328168).

Almost surely, 2^20727818685 is an apocalyptic number.

It is an amenable number.

20727818685 is an abundant number, since it is smaller than the sum of its proper divisors (21287933379).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20727818685 is a wasteful number, since it uses less digits than its factorization.

20727818685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1530354 (or 1530351 counting only the distinct ones).

The product of its (nonzero) digits is 3010560, while the sum is 54.

The spelling of 20727818685 in words is "twenty billion, seven hundred twenty-seven million, eight hundred eighteen thousand, six hundred eighty-five".