20306245181 has 2 divisors, whose sum is σ = 20306245182. Its totient is φ = 20306245180.

The previous prime is 20306245159. The next prime is 20306245207. The reversal of 20306245181 is 18154260302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20064722500 + 241522681 = 141650^2 + 15541^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20306245181 is a prime.

It is a super-2 number, since 2×20306245181² (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 (20306245081) 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, 10153122590 + 10153122591.

It is an arithmetic number, because the mean of its divisors is an integer number (10153122591).

Almost surely, 2^20306245181 is an apocalyptic number.

It is an amenable number.

20306245181 is a deficient number, since it is larger than the sum of its proper divisors (1).

20306245181 is an equidigital number, since it uses as much as digits as its factorization.

20306245181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11520, while the sum is 32.

The spelling of 20306245181 in words is "twenty billion, three hundred six million, two hundred forty-five thousand, one hundred eighty-one".