2020001 has 2 divisors, whose sum is σ = 2020002.
Its totient is φ = 2020000.
The previous prime is 2019977. The next prime is 2020003. The reversal of 2020001 is 1000202.
It is a strong prime.
It can be written as a sum of positive squares in only one way, i.e., 1442401 + 577600 = 1201^2 + 760^2
It is a cyclic number.
It is a de Polignac number, because none of the positive numbers 2k-2020001 is a prime.
Together with 2020003, it forms a pair of twin primes.
It is a Chen prime.
It is not a weakly prime, because it can be changed into another prime (2020003) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (11) of ones.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010000 + 1010001.
It is an arithmetic number, because the mean of its divisors is an integer number (1010001).
22020001 is an apocalyptic number.
It is an amenable number.
2020001 is a deficient number, since it is larger than the sum of its proper divisors (1).
2020001 is an equidigital number, since it uses as much as digits as its factorization.
2020001 is an odious number, because the sum of its binary digits is odd.
The product of its (nonzero) digits is 4, while the sum is 5.
The square root of 2020001 is about 1421.2673921539.
The cubic root of 2020001 is about 126.4107073462.
Adding to 2020001 its reverse (1000202), we get a palindrome (3020203).
Multiplying 2020001 by its reverse (1000202), we get a palindrome (2020409040202).
The spelling of 2020001 in words is "two million, twenty thousand, one".