20121118 has 16 divisors (see below), whose sum is σ = 31256064. Its totient is φ = 9707040.

The previous prime is 20121107. The next prime is 20121121. The reversal of 20121118 is 81112102.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8328 + ... + 10468.

It is an arithmetic number, because the mean of its divisors is an integer number (1953504).

Almost surely, 2^20121118 is an apocalyptic number.

20121118 is a deficient number, since it is larger than the sum of its proper divisors (11134946).

20121118 is a wasteful number, since it uses less digits than its factorization.

20121118 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2307.

The product of its (nonzero) digits is 32, while the sum is 16.

The square root of 20121118 is about 4485.6569195604. The cubic root of 20121118 is about 271.9886006613.

The spelling of 20121118 in words is "twenty million, one hundred twenty-one thousand, one hundred eighteen".