20590681109 has 2 divisors, whose sum is σ = 20590681110. Its totient is φ = 20590681108.

The previous prime is 20590681087. The next prime is 20590681141. The reversal of 20590681109 is 90118609502.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18781880209 + 1808800900 = 137047^2 + 42530^2 .

It is a cyclic number.

It is not a de Polignac number, because 20590681109 - 2²⁰ = 20589632533 is a prime.

It is a super-2 number, since 2×20590681109² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20590681169) 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 as a sum of consecutive naturals, namely, 10295340554 + 10295340555.

It is an arithmetic number, because the mean of its divisors is an integer number (10295340555).

Almost surely, 2^20590681109 is an apocalyptic number.

It is an amenable number.

20590681109 is a deficient number, since it is larger than the sum of its proper divisors (1).

20590681109 is an equidigital number, since it uses as much as digits as its factorization.

20590681109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 38880, while the sum is 41.

The spelling of 20590681109 in words is "twenty billion, five hundred ninety million, six hundred eighty-one thousand, one hundred nine".