20118090 has 32 divisors (see below), whose sum is σ = 49008960. Its totient is φ = 5284224.

The previous prime is 20118073. The next prime is 20118097. The reversal of 20118090 is 9081102.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20118097) 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, 2995 + ... + 7014.

It is an arithmetic number, because the mean of its divisors is an integer number (1531530).

Almost surely, 2^20118090 is an apocalyptic number.

20118090 is an abundant number, since it is smaller than the sum of its proper divisors (28890870).

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

20118090 is a wasteful number, since it uses less digits than its factorization.

20118090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10086.

The product of its (nonzero) digits is 144, while the sum is 21.

The square root of 20118090 is about 4485.3193866212. The cubic root of 20118090 is about 271.9749562438.

Adding to 20118090 its reverse (9081102), we get a palindrome (29199192).

It can be divided in two parts, 2011 and 8090, that added together give a palindrome (10101).

The spelling of 20118090 in words is "twenty million, one hundred eighteen thousand, ninety".