20926530 has 48 divisors (see below), whose sum is σ = 54792504. Its totient is φ = 5541120.

The previous prime is 20926513. The next prime is 20926531. The reversal of 20926530 is 3562902.

20926530 is a `hidden beast` number, since 2 + 0 + 9 + 2 + 653 + 0 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 14130081 + 6796449 = 3759^2 + 2607^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20926494 and 20926503.

It is not an unprimeable number, because it can be changed into a prime (20926531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13390 + ... + 14870.

Almost surely, 2^20926530 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20926530, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27396252).

20926530 is an abundant number, since it is smaller than the sum of its proper divisors (33865974).

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

20926530 is a wasteful number, since it uses less digits than its factorization.

20926530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1651 (or 1648 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 27.

The square root of 20926530 is about 4574.5524371243. The cubic root of 20926530 is about 275.5702985835.

The spelling of 20926530 in words is "twenty million, nine hundred twenty-six thousand, five hundred thirty".