20673305231 has 4 divisors (see below), whose sum is σ = 20673627072. Its totient is φ = 20672983392.

The previous prime is 20673305227. The next prime is 20673305251. The reversal of 20673305231 is 13250337602.

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 20673305231 - 2² = 20673305227 is a prime.

It is a super-2 number, since 2×20673305231² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20673305251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27935 + ... + 205248.

It is an arithmetic number, because the mean of its divisors is an integer number (5168406768).

Almost surely, 2^20673305231 is an apocalyptic number.

20673305231 is a deficient number, since it is larger than the sum of its proper divisors (321841).

20673305231 is an equidigital number, since it uses as much as digits as its factorization.

20673305231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321840.

The product of its (nonzero) digits is 22680, while the sum is 32.

The spelling of 20673305231 in words is "twenty billion, six hundred seventy-three million, three hundred five thousand, two hundred thirty-one".