20340018 has 32 divisors (see below), whose sum is σ = 46307520. Its totient is φ = 6613920.

The previous prime is 20340011. The next prime is 20340029. The reversal of 20340018 is 81004302.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20340011) 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 15 ways as a sum of consecutive naturals, for example, 2380 + ... + 6807.

It is an arithmetic number, because the mean of its divisors is an integer number (1447110).

Almost surely, 2^20340018 is an apocalyptic number.

20340018 is an abundant number, since it is smaller than the sum of its proper divisors (25967502).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20340018 is a wasteful number, since it uses less digits than its factorization.

20340018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9239 (or 9233 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 20340018 is about 4509.9909090817. The cubic root of 20340018 is about 272.9713772672.

The spelling of 20340018 in words is "twenty million, three hundred forty thousand, eighteen".