20687941712 has 20 divisors (see below), whose sum is σ = 40089675540. Its totient is φ = 10342219008.

The previous prime is 20687941691. The next prime is 20687941739. The reversal of 20687941712 is 21714978602.

It can be written as a sum of positive squares in 2 ways, for example, as 17214489616 + 3473452096 = 131204^2 + 58936^2 .

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9287 + ... + 203622.

It is an arithmetic number, because the mean of its divisors is an integer number (2004483777).

Almost surely, 2^20687941712 is an apocalyptic number.

It is an amenable number.

20687941712 is a deficient number, since it is larger than the sum of its proper divisors (19401733828).

20687941712 is a wasteful number, since it uses less digits than its factorization.

20687941712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218990 (or 218984 counting only the distinct ones).

The product of its (nonzero) digits is 338688, while the sum is 47.

The spelling of 20687941712 in words is "twenty billion, six hundred eighty-seven million, nine hundred forty-one thousand, seven hundred twelve".