20180106 has 24 divisors (see below), whose sum is σ = 43810884. Its totient is φ = 6713280.

The previous prime is 20180087. The next prime is 20180123. The reversal of 20180106 is 60108102.

It can be written as a sum of positive squares in 2 ways, for example, as 20169081 + 11025 = 4491^2 + 105^2 .

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

It is a Curzon number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 12886 + ... + 14366.

Almost surely, 2^20180106 is an apocalyptic number.

20180106 is an abundant number, since it is smaller than the sum of its proper divisors (23630778).

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

20180106 is a wasteful number, since it uses less digits than its factorization.

20180106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2246 (or 2243 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

The square root of 20180106 is about 4492.2272872151. The cubic root of 20180106 is about 272.2541328011.

Adding to 20180106 its reverse (60108102), we get a palindrome (80288208).

The spelling of 20180106 in words is "twenty million, one hundred eighty thousand, one hundred six".