20718012 has 24 divisors (see below), whose sum is σ = 55248256. Its totient is φ = 5919408.

The previous prime is 20718011. The next prime is 20718017. The reversal of 20718012 is 21081702.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a self number, because there is not a number n which added to its sum of digits gives 20718012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20718011) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 123238 + ... + 123405.

Almost surely, 2^20718012 is an apocalyptic number.

It is an amenable number.

20718012 is an abundant number, since it is smaller than the sum of its proper divisors (34530244).

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

20718012 is a wasteful number, since it uses less digits than its factorization.

20718012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 246657 (or 246655 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 21.

The square root of 20718012 is about 4551.7042961950. The cubic root of 20718012 is about 274.6519541820.

Adding to 20718012 its reverse (21081702), we get a palindrome (41799714).

The spelling of 20718012 in words is "twenty million, seven hundred eighteen thousand, twelve".