20688681270 has 16 divisors (see below), whose sum is σ = 49652835120. Its totient is φ = 5516981664.

The previous prime is 20688681257. The next prime is 20688681271. The reversal of 20688681270 is 7218688602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20688681271) 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, 344811325 + ... + 344811384.

It is an arithmetic number, because the mean of its divisors is an integer number (3103302195).

Almost surely, 2^20688681270 is an apocalyptic number.

20688681270 is an abundant number, since it is smaller than the sum of its proper divisors (28964153850).

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

20688681270 is a wasteful number, since it uses less digits than its factorization.

20688681270 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 689622719.

The product of its (nonzero) digits is 516096, while the sum is 48.

The spelling of 20688681270 in words is "twenty billion, six hundred eighty-eight million, six hundred eighty-one thousand, two hundred seventy".