20321018 has 8 divisors (see below), whose sum is σ = 32274612. Its totient is φ = 9562816.

The previous prime is 20321011. The next prime is 20321023. The reversal of 20321018 is 81012302.

It can be written as a sum of positive squares in 2 ways, for example, as 20097289 + 223729 = 4483^2 + 473^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20320987 and 20321005.

It is not an unprimeable number, because it can be changed into a prime (20321011) 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 in 3 ways as a sum of consecutive naturals, for example, 298805 + ... + 298872.

Almost surely, 2^20321018 is an apocalyptic number.

20321018 is a deficient number, since it is larger than the sum of its proper divisors (11953594).

20321018 is a wasteful number, since it uses less digits than its factorization.

20321018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 597696.

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 20321018 is about 4507.8839825355. The cubic root of 20321018 is about 272.8863548592.

The spelling of 20321018 in words is "twenty million, three hundred twenty-one thousand, eighteen".