20201722061 has 2 divisors, whose sum is σ = 20201722062. Its totient is φ = 20201722060.

The previous prime is 20201721983. The next prime is 20201722063. The reversal of 20201722061 is 16022710202.

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., 20176782025 + 24940036 = 142045^2 + 4994^2 .

It is a cyclic number.

It is not a de Polignac number, because 20201722061 - 2¹⁰ = 20201721037 is a prime.

Together with 20201722063, 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 (20201722063) 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, 10100861030 + 10100861031.

It is an arithmetic number, because the mean of its divisors is an integer number (10100861031).

Almost surely, 2^20201722061 is an apocalyptic number.

It is an amenable number.

20201722061 is a deficient number, since it is larger than the sum of its proper divisors (1).

20201722061 is an equidigital number, since it uses as much as digits as its factorization.

20201722061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 672, while the sum is 23.

The spelling of 20201722061 in words is "twenty billion, two hundred one million, seven hundred twenty-two thousand, sixty-one".