20605266 has 80 divisors (see below), whose sum is σ = 52132608. Its totient is φ = 6026400.

The previous prime is 20605229. The next prime is 20605267. The reversal of 20605266 is 66250602.

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

It is not an unprimeable number, because it can be changed into a prime (20605267) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 55056 + ... + 55428.

Almost surely, 2^20605266 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20605266, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26066304).

20605266 is an abundant number, since it is smaller than the sum of its proper divisors (31527342).

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

20605266 is a wasteful number, since it uses less digits than its factorization.

20605266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 429 (or 420 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 20605266 is about 4539.3023693074. The cubic root of 20605266 is about 274.1528353297.

Adding to 20605266 its reverse (66250602), we get a palindrome (86855868).

The spelling of 20605266 in words is "twenty million, six hundred five thousand, two hundred sixty-six".