20731326 has 64 divisors (see below), whose sum is σ = 53968896. Its totient is φ = 5148000.

The previous prime is 20731309. The next prime is 20731327. The reversal of 20731326 is 62313702.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20731296 and 20731305.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20731327) 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, 9651 + ... + 11601.

It is an arithmetic number, because the mean of its divisors is an integer number (843264).

Almost surely, 2^20731326 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20731326, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26984448).

20731326 is an abundant number, since it is smaller than the sum of its proper divisors (33237570).

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

20731326 is a wasteful number, since it uses less digits than its factorization.

20731326 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1997.

The product of its (nonzero) digits is 1512, while the sum is 24.

The square root of 20731326 is about 4553.1665904072. The cubic root of 20731326 is about 274.7107747081.

The spelling of 20731326 in words is "twenty million, seven hundred thirty-one thousand, three hundred twenty-six".