20840675731 has 2 divisors, whose sum is σ = 20840675732. Its totient is φ = 20840675730.

The previous prime is 20840675707. The next prime is 20840675761. The reversal of 20840675731 is 13757604802.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20840675731 - 2⁵ = 20840675699 is a prime.

It is a super-2 number, since 2×20840675731² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20840675701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10420337865 + 10420337866.

It is an arithmetic number, because the mean of its divisors is an integer number (10420337866).

Almost surely, 2^20840675731 is an apocalyptic number.

20840675731 is a deficient number, since it is larger than the sum of its proper divisors (1).

20840675731 is an equidigital number, since it uses as much as digits as its factorization.

20840675731 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 282240, while the sum is 43.

The spelling of 20840675731 in words is "twenty billion, eight hundred forty million, six hundred seventy-five thousand, seven hundred thirty-one".