100020018 has 16 divisors (see below), whose sum is σ = 228617280. Its totient is φ = 28577136.

The previous prime is 100019977. The next prime is 100020023. The reversal of 100020018 is 810020001.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 100019985 and 100020012.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1190673 + ... + 1190756.

It is an arithmetic number, because the mean of its divisors is an integer number (14288580).

Almost surely, 2^100020018 is an apocalyptic number.

100020018 is an abundant number, since it is smaller than the sum of its proper divisors (128597262).

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

100020018 is a wasteful number, since it uses less digits than its factorization.

100020018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2381441.

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 100020018 is about 10001.0008499150. Note that the first 3 decimals coincide. The cubic root of 100020018 is about 464.1898530700.

Adding to 100020018 its reverse (810020001), we get a palindrome (910040019).

The spelling of 100020018 in words is "one hundred million, twenty thousand, eighteen".