20322666 has 96 divisors (see below), whose sum is σ = 57133440. Its totient is φ = 5069952.

The previous prime is 20322661. The next prime is 20322697. The reversal of 20322666 is 66622302.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (20322661) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 30796 + ... + 31448.

It is an arithmetic number, because the mean of its divisors is an integer number (595140).

Almost surely, 2^20322666 is an apocalyptic number.

20322666 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 20322666, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28566720).

20322666 is an abundant number, since it is smaller than the sum of its proper divisors (36810774).

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

20322666 is a wasteful number, since it uses less digits than its factorization.

20322666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 700 (or 697 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 27.

The square root of 20322666 is about 4508.0667696919. The cubic root of 20322666 is about 272.8937315329.

Adding to 20322666 its reverse (66622302), we get a palindrome (86944968).

The spelling of 20322666 in words is "twenty million, three hundred twenty-two thousand, six hundred sixty-six".