20685346916 has 24 divisors (see below), whose sum is σ = 39008490360. Its totient is φ = 9541066752.

The previous prime is 20685346883. The next prime is 20685346919. The reversal of 20685346916 is 61964358602.

It can be written as a sum of positive squares in 4 ways, for example, as 1434894400 + 19250452516 = 37880^2 + 138746^2 .

It is a super-2 number, since 2×20685346916² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20685346919) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41501 + ... + 207588.

It is an arithmetic number, because the mean of its divisors is an integer number (1625353765).

Almost surely, 2^20685346916 is an apocalyptic number.

20685346916 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

20685346916 is a deficient number, since it is larger than the sum of its proper divisors (18323143444).

20685346916 is a wasteful number, since it uses less digits than its factorization.

20685346916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 250703 (or 250701 counting only the distinct ones).

The product of its (nonzero) digits is 1866240, while the sum is 50.

The spelling of 20685346916 in words is "twenty billion, six hundred eighty-five million, three hundred forty-six thousand, nine hundred sixteen".