20723168 has 48 divisors (see below), whose sum is σ = 42774480. Its totient is φ = 9870336.

The previous prime is 20723137. The next prime is 20723173. The reversal of 20723168 is 86132702.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a self number, because there is not a number n which added to its sum of digits gives 20723168.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 127055 + ... + 127217.

It is an arithmetic number, because the mean of its divisors is an integer number (891135).

Almost surely, 2^20723168 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 20723168, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21387240).

20723168 is an abundant number, since it is smaller than the sum of its proper divisors (22051312).

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

20723168 is a wasteful number, since it uses less digits than its factorization.

20723168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 339 (or 331 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 20723168 is about 4552.2706422180. The cubic root of 20723168 is about 274.6747360979.

The spelling of 20723168 in words is "twenty million, seven hundred twenty-three thousand, one hundred sixty-eight".