20715318 has 64 divisors (see below), whose sum is σ = 51770880. Its totient is φ = 6092064.

The previous prime is 20715271. The next prime is 20715319. The reversal of 20715318 is 81351702.

It is a super-2 number, since 2×20715318² = 858248799682248, which contains 22 as substring.

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

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20715291 and 20715300.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20715319) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15505 + ... + 16787.

It is an arithmetic number, because the mean of its divisors is an integer number (808920).

Almost surely, 2^20715318 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20715318, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25885440).

20715318 is an abundant number, since it is smaller than the sum of its proper divisors (31055562).

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

20715318 is a wasteful number, since it uses less digits than its factorization.

20715318 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1330 (or 1324 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 27.

The square root of 20715318 is about 4551.4083534660. The cubic root of 20715318 is about 274.6400491718.

The spelling of 20715318 in words is "twenty million, seven hundred fifteen thousand, three hundred eighteen".