20685610194560 has 64 divisors (see below), whose sum is σ = 52360450832520. Its totient is φ = 7787523833856.

The previous prime is 20685610194559. The next prime is 20685610194581. The reversal of 20685610194560 is 6549101658602.

It can be written as a sum of positive squares in 4 ways, for example, as 20661679342144 + 23930852416 = 4545512^2 + 154696^2 .

It is a tau number, because it is divible by the number of its divisors (64).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 950614589 + ... + 950636348.

Almost surely, 2^{20685610194560} is an apocalyptic number.

20685610194560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20685610194560 is an abundant number, since it is smaller than the sum of its proper divisors (31674840637960).

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

20685610194560 is a wasteful number, since it uses less digits than its factorization.

20685610194560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1901250973 (or 1901250961 counting only the distinct ones).

The product of its (nonzero) digits is 3110400, while the sum is 53.

The spelling of 20685610194560 in words is "twenty trillion, six hundred eighty-five billion, six hundred ten million, one hundred ninety-four thousand, five hundred sixty".