20743218 has 24 divisors (see below), whose sum is σ = 45579456. Its totient is φ = 6816600.

The previous prime is 20743211. The next prime is 20743271. The reversal of 20743218 is 81234702.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20743191 and 20743200.

It is not an unprimeable number, because it can be changed into a prime (20743211) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6838 + ... + 9393.

It is an arithmetic number, because the mean of its divisors is an integer number (1899144).

Almost surely, 2^20743218 is an apocalyptic number.

20743218 is an abundant number, since it is smaller than the sum of its proper divisors (24836238).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20743218 is a wasteful number, since it uses less digits than its factorization.

20743218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16310 (or 16307 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 20743218 is about 4554.4723075237. The cubic root of 20743218 is about 274.7632916267.

The spelling of 20743218 in words is "twenty million, seven hundred forty-three thousand, two hundred eighteen".