20018969 has 2 divisors, whose sum is σ = 20018970. Its totient is φ = 20018968.

The previous prime is 20018959. The next prime is 20018981. The reversal of 20018969 is 96981002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14784025 + 5234944 = 3845^2 + 2288^2 .

It is a cyclic number.

It is not a de Polignac number, because 20018969 - 2⁴ = 20018953 is a prime.

It is a super-2 number, since 2×20018969² = 801518239645922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20018909) 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, 10009484 + 10009485.

It is an arithmetic number, because the mean of its divisors is an integer number (10009485).

Almost surely, 2^20018969 is an apocalyptic number.

It is an amenable number.

20018969 is a deficient number, since it is larger than the sum of its proper divisors (1).

20018969 is an equidigital number, since it uses as much as digits as its factorization.

20018969 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 35.

The square root of 20018969 is about 4474.2562510433. The cubic root of 20018969 is about 271.5275508559.

The spelling of 20018969 in words is "twenty million, eighteen thousand, nine hundred sixty-nine".