20688097247 has 4 divisors (see below), whose sum is σ = 21587579760. Its totient is φ = 19788614736.

The previous prime is 20688097229. The next prime is 20688097253. The reversal of 20688097247 is 74279088602.

It is a happy number.

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 20688097247 - 2¹⁰ = 20688096223 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20688099247) 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, 449741222 + ... + 449741267.

It is an arithmetic number, because the mean of its divisors is an integer number (5396894940).

Almost surely, 2^20688097247 is an apocalyptic number.

20688097247 is a deficient number, since it is larger than the sum of its proper divisors (899482513).

20688097247 is an equidigital number, since it uses as much as digits as its factorization.

20688097247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 899482512.

The product of its (nonzero) digits is 2709504, while the sum is 53.

The spelling of 20688097247 in words is "twenty billion, six hundred eighty-eight million, ninety-seven thousand, two hundred forty-seven".