20011918 has 8 divisors (see below), whose sum is σ = 30440880. Its totient is φ = 9864960.

The previous prime is 20011913. The next prime is 20011919. The reversal of 20011918 is 81911002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20011913) 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 3 ways as a sum of consecutive naturals, for example, 70323 + ... + 70606.

It is an arithmetic number, because the mean of its divisors is an integer number (3805110).

Almost surely, 2^20011918 is an apocalyptic number.

20011918 is a deficient number, since it is larger than the sum of its proper divisors (10428962).

20011918 is a wasteful number, since it uses less digits than its factorization.

20011918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141002.

The product of its (nonzero) digits is 144, while the sum is 22.

The square root of 20011918 is about 4473.4682294613. The cubic root of 20011918 is about 271.4956683352.

The spelling of 20011918 in words is "twenty million, eleven thousand, nine hundred eighteen".