20118365 has 4 divisors (see below), whose sum is σ = 24142044. Its totient is φ = 16094688.

The previous prime is 20118341. The next prime is 20118379. The reversal of 20118365 is 56381102.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56381102 = 2 ⋅28190551.

It can be written as a sum of positive squares in 2 ways, for example, as 15194404 + 4923961 = 3898^2 + 2219^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20118365 is a prime.

It is a super-2 number, since 2×20118365² = 809497220546450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2011832 + ... + 2011841.

It is an arithmetic number, because the mean of its divisors is an integer number (6035511).

Almost surely, 2^20118365 is an apocalyptic number.

It is an amenable number.

20118365 is a deficient number, since it is larger than the sum of its proper divisors (4023679).

20118365 is an equidigital number, since it uses as much as digits as its factorization.

20118365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4023678.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 20118365 is about 4485.3500420814. The cubic root of 20118365 is about 271.9761954730.

Adding to 20118365 its reverse (56381102), we get a palindrome (76499467).

The spelling of 20118365 in words is "twenty million, one hundred eighteen thousand, three hundred sixty-five".