20685763231 has 4 divisors (see below), whose sum is σ = 23640872272. Its totient is φ = 17730654192.

The previous prime is 20685763177. The next prime is 20685763247. The reversal of 20685763231 is 13236758602.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13236758602 = 2 ⋅6618379301.

It is a cyclic number.

It is not a de Polignac number, because 20685763231 - 2¹³ = 20685755039 is a prime.

It is a super-3 number, since 3×20685763231³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20685763291) 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, 1477554510 + ... + 1477554523.

It is an arithmetic number, because the mean of its divisors is an integer number (5910218068).

Almost surely, 2^20685763231 is an apocalyptic number.

20685763231 is a deficient number, since it is larger than the sum of its proper divisors (2955109041).

20685763231 is an equidigital number, since it uses as much as digits as its factorization.

20685763231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2955109040.

The product of its (nonzero) digits is 362880, while the sum is 43.

The spelling of 20685763231 in words is "twenty billion, six hundred eighty-five million, seven hundred sixty-three thousand, two hundred thirty-one".