20303201981 has 2 divisors, whose sum is σ = 20303201982. Its totient is φ = 20303201980.

The previous prime is 20303201959. The next prime is 20303202013. The reversal of 20303201981 is 18910230302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11327344900 + 8975857081 = 106430^2 + 94741^2 .

It is a cyclic number.

It is not a de Polignac number, because 20303201981 - 2²⁶ = 20236093117 is a prime.

It is a super-2 number, since 2×20303201981² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20303201951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10151600990 + 10151600991.

It is an arithmetic number, because the mean of its divisors is an integer number (10151600991).

Almost surely, 2^20303201981 is an apocalyptic number.

It is an amenable number.

20303201981 is a deficient number, since it is larger than the sum of its proper divisors (1).

20303201981 is an equidigital number, since it uses as much as digits as its factorization.

20303201981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 29.

The spelling of 20303201981 in words is "twenty billion, three hundred three million, two hundred one thousand, nine hundred eighty-one".