20001019 has 2 divisors, whose sum is σ = 20001020. Its totient is φ = 20001018.

The previous prime is 20001001. The next prime is 20001029. The reversal of 20001019 is 91010002.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20001019 - 2⁹ = 20000507 is a prime.

It is a super-2 number, since 2×20001019² = 800081522076722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20001029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10000509 + 10000510.

It is an arithmetic number, because the mean of its divisors is an integer number (10000510).

Almost surely, 2^20001019 is an apocalyptic number.

20001019 is a deficient number, since it is larger than the sum of its proper divisors (1).

20001019 is an equidigital number, since it uses as much as digits as its factorization.

20001019 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18, while the sum is 13.

The square root of 20001019 is about 4472.2498812119. The cubic root of 20001019 is about 271.4463715671.

The spelling of 20001019 in words is "twenty million, one thousand, nineteen".