20718306 has 24 divisors (see below), whose sum is σ = 51302784. Its totient is φ = 5919480.

The previous prime is 20718287. The next prime is 20718311. The reversal of 20718306 is 60381702.

It is a self number, because there is not a number n which added to its sum of digits gives 20718306.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 82090 + ... + 82341.

It is an arithmetic number, because the mean of its divisors is an integer number (2137616).

Almost surely, 2^20718306 is an apocalyptic number.

20718306 is an abundant number, since it is smaller than the sum of its proper divisors (30584478).

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

20718306 is a wasteful number, since it uses less digits than its factorization.

20718306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164446 (or 164443 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 20718306 is about 4551.7365916758. The cubic root of 20718306 is about 274.6532533301.

The spelling of 20718306 in words is "twenty million, seven hundred eighteen thousand, three hundred six".