20718612 has 48 divisors (see below), whose sum is σ = 55036800. Its totient is φ = 6736320.

The previous prime is 20718583. The next prime is 20718637. The reversal of 20718612 is 21681702.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2089 + ... + 6767.

It is an arithmetic number, because the mean of its divisors is an integer number (1146600).

Almost surely, 2^20718612 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20718612, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27518400).

20718612 is an abundant number, since it is smaller than the sum of its proper divisors (34318188).

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

20718612 is a wasteful number, since it uses less digits than its factorization.

20718612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4733 (or 4725 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 27.

The square root of 20718612 is about 4551.7702050960. The cubic root of 20718612 is about 274.6546054915.

The spelling of 20718612 in words is "twenty million, seven hundred eighteen thousand, six hundred twelve".