20840675249 has 2 divisors, whose sum is σ = 20840675250. Its totient is φ = 20840675248.

The previous prime is 20840675239. The next prime is 20840675269. The reversal of 20840675249 is 94257604802.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20010082849 + 830592400 = 141457^2 + 28820^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20840675249 is a prime.

It is not a weakly prime, because it can be changed into another prime (20840675209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10420337624 + 10420337625.

It is an arithmetic number, because the mean of its divisors is an integer number (10420337625).

Almost surely, 2^20840675249 is an apocalyptic number.

It is an amenable number.

20840675249 is a deficient number, since it is larger than the sum of its proper divisors (1).

20840675249 is an equidigital number, since it uses as much as digits as its factorization.

20840675249 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 967680, while the sum is 47.

The spelling of 20840675249 in words is "twenty billion, eight hundred forty million, six hundred seventy-five thousand, two hundred forty-nine".