20692144849 has 2 divisors, whose sum is σ = 20692144850. Its totient is φ = 20692144848.

The previous prime is 20692144793. The next prime is 20692144877. The reversal of 20692144849 is 94844129602.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11186869824 + 9505275025 = 105768^2 + 97495^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20692144849 is a prime.

It is not a weakly prime, because it can be changed into another prime (20692144549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10346072424 + 10346072425.

It is an arithmetic number, because the mean of its divisors is an integer number (10346072425).

Almost surely, 2^20692144849 is an apocalyptic number.

It is an amenable number.

20692144849 is a deficient number, since it is larger than the sum of its proper divisors (1).

20692144849 is an equidigital number, since it uses as much as digits as its factorization.

20692144849 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 995328, while the sum is 49.

The spelling of 20692144849 in words is "twenty billion, six hundred ninety-two million, one hundred forty-four thousand, eight hundred forty-nine".