20680021707 has 4 divisors (see below), whose sum is σ = 27573362280. Its totient is φ = 13786681136.

The previous prime is 20680021699. The next prime is 20680021709. The reversal of 20680021707 is 70712008602.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20680021707 - 2³ = 20680021699 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20680021709) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3446670282 + ... + 3446670287.

It is an arithmetic number, because the mean of its divisors is an integer number (6893340570).

Almost surely, 2^20680021707 is an apocalyptic number.

20680021707 is a deficient number, since it is larger than the sum of its proper divisors (6893340573).

20680021707 is an equidigital number, since it uses as much as digits as its factorization.

20680021707 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6893340572.

The product of its (nonzero) digits is 9408, while the sum is 33.

The spelling of 20680021707 in words is "twenty billion, six hundred eighty million, twenty-one thousand, seven hundred seven".