20118893 has 4 divisors (see below), whose sum is σ = 20303580. Its totient is φ = 19934208.

The previous prime is 20118881. The next prime is 20118911. The reversal of 20118893 is 39881102.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 39881102 = 2 ⋅19940551.

It can be written as a sum of positive squares in 2 ways, for example, as 8305924 + 11812969 = 2882^2 + 3437^2 .

It is a cyclic number.

It is not a de Polignac number, because 20118893 - 2⁴ = 20118877 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 (20118193) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 92180 + ... + 92397.

It is an arithmetic number, because the mean of its divisors is an integer number (5075895).

Almost surely, 2^20118893 is an apocalyptic number.

It is an amenable number.

20118893 is a deficient number, since it is larger than the sum of its proper divisors (184687).

20118893 is a wasteful number, since it uses less digits than its factorization.

20118893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184686.

The product of its (nonzero) digits is 3456, while the sum is 32.

The square root of 20118893 is about 4485.4088999778. The cubic root of 20118893 is about 271.9785747614.

Adding to 20118893 its reverse (39881102), we get a palindrome (59999995).

The spelling of 20118893 in words is "twenty million, one hundred eighteen thousand, eight hundred ninety-three".