20440056673 has 2 divisors, whose sum is σ = 20440056674. Its totient is φ = 20440056672.

The previous prime is 20440056661. The next prime is 20440056697. The reversal of 20440056673 is 37665004402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20274342544 + 165714129 = 142388^2 + 12873^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20440056673 is a prime.

It is not a weakly prime, because it can be changed into another prime (20440056643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10220028336 + 10220028337.

It is an arithmetic number, because the mean of its divisors is an integer number (10220028337).

Almost surely, 2^20440056673 is an apocalyptic number.

It is an amenable number.

20440056673 is a deficient number, since it is larger than the sum of its proper divisors (1).

20440056673 is an equidigital number, since it uses as much as digits as its factorization.

20440056673 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 120960, while the sum is 37.

The spelling of 20440056673 in words is "twenty billion, four hundred forty million, fifty-six thousand, six hundred seventy-three".