20201120020181 has 2 divisors, whose sum is σ = 20201120020182. Its totient is φ = 20201120020180.

The previous prime is 20201120020111. The next prime is 20201120020183. The reversal of 20201120020181 is 18102002110202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18806394449956 + 1394725570225 = 4336634^2 + 1180985^2 .

It is a cyclic number.

It is not a de Polignac number, because 20201120020181 - 2¹⁴ = 20201120003797 is a prime.

It is a super-2 number, since 2×20201120020181² (a number of 27 digits) contains 22 as substring.

Together with 20201120020183, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20201120020183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10100560010090 + 10100560010091.

It is an arithmetic number, because the mean of its divisors is an integer number (10100560010091).

Almost surely, 2^{20201120020181} is an apocalyptic number.

It is an amenable number.

20201120020181 is a deficient number, since it is larger than the sum of its proper divisors (1).

20201120020181 is an equidigital number, since it uses as much as digits as its factorization.

20201120020181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 20201120020181 its reverse (18102002110202), we get a palindrome (38303122130383).

The spelling of 20201120020181 in words is "twenty trillion, two hundred one billion, one hundred twenty million, twenty thousand, one hundred eighty-one".