20326530 has 64 divisors (see below), whose sum is σ = 57074688. Its totient is φ = 4536000.

The previous prime is 20326511. The next prime is 20326531. The reversal of 20326530 is 3562302.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20326497 and 20326506.

It is not an unprimeable number, because it can be changed into a prime (20326531) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7905 + ... + 10155.

It is an arithmetic number, because the mean of its divisors is an integer number (891792).

Almost surely, 2^20326530 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20326530, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28537344).

20326530 is an abundant number, since it is smaller than the sum of its proper divisors (36748158).

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

20326530 is a wasteful number, since it uses less digits than its factorization.

20326530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2311.

The product of its (nonzero) digits is 1080, while the sum is 21.

The square root of 20326530 is about 4508.4953144037. The cubic root of 20326530 is about 272.9110257625.

Adding to 20326530 its reverse (3562302), we get a palindrome (23888832).

The spelling of 20326530 in words is "twenty million, three hundred twenty-six thousand, five hundred thirty".