20718124 has 48 divisors (see below), whose sum is σ = 44126208. Its totient is φ = 8319168.

The previous prime is 20718109. The next prime is 20718149. The reversal of 20718124 is 42181702.

It is a happy 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, 33829 + ... + 34435.

It is an arithmetic number, because the mean of its divisors is an integer number (919296).

Almost surely, 2^20718124 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 20718124, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22063104).

20718124 is an abundant number, since it is smaller than the sum of its proper divisors (23408084).

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

20718124 is a wasteful number, since it uses less digits than its factorization.

20718124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 694 (or 692 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 25.

The square root of 20718124 is about 4551.7165992623. The cubic root of 20718124 is about 274.6524490970.

Adding to 20718124 its reverse (42181702), we get a palindrome (62899826).

The spelling of 20718124 in words is "twenty million, seven hundred eighteen thousand, one hundred twenty-four".