20686850685 has 64 divisors (see below), whose sum is σ = 38750688000. Its totient is φ = 10441923840.

The previous prime is 20686850677. The next prime is 20686850719. The reversal of 20686850685 is 58605868602.

It is not a de Polignac number, because 20686850685 - 2³ = 20686850677 is a prime.

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3025851 + ... + 3032679.

It is an arithmetic number, because the mean of its divisors is an integer number (605479500).

Almost surely, 2^20686850685 is an apocalyptic number.

It is an amenable number.

20686850685 is a deficient number, since it is larger than the sum of its proper divisors (18063837315).

20686850685 is a wasteful number, since it uses less digits than its factorization.

20686850685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8043 (or 8037 counting only the distinct ones).

The product of its (nonzero) digits is 5529600, while the sum is 54.

The spelling of 20686850685 in words is "twenty billion, six hundred eighty-six million, eight hundred fifty thousand, six hundred eighty-five".