20118655 has 4 divisors (see below), whose sum is σ = 24142392. Its totient is φ = 16094920.

The previous prime is 20118653. The next prime is 20118661. The reversal of 20118655 is 55681102.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 20118655 - 2¹ = 20118653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20118653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2011861 + ... + 2011870.

It is an arithmetic number, because the mean of its divisors is an integer number (6035598).

Almost surely, 2^20118655 is an apocalyptic number.

20118655 is a deficient number, since it is larger than the sum of its proper divisors (4023737).

20118655 is an equidigital number, since it uses as much as digits as its factorization.

20118655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4023736.

The product of its (nonzero) digits is 2400, while the sum is 28.

The square root of 20118655 is about 4485.3823694307. The cubic root of 20118655 is about 271.9775022843.

Adding to 20118655 its reverse (55681102), we get a palindrome (75799757).

The spelling of 20118655 in words is "twenty million, one hundred eighteen thousand, six hundred fifty-five".