20650266 has 72 divisors (see below), whose sum is σ = 56081844. Its totient is φ = 5443200.

The previous prime is 20650237. The next prime is 20650303. The reversal of 20650266 is 66205602.

20650266 is a `hidden beast` number, since 2 + 0 + 650 + 2 + 6 + 6 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 17464041 + 3186225 = 4179^2 + 1785^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 10566 + ... + 12366.

Almost surely, 2^20650266 is an apocalyptic number.

20650266 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 20650266, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28040922).

20650266 is an abundant number, since it is smaller than the sum of its proper divisors (35431578).

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

20650266 is a wasteful number, since it uses less digits than its factorization.

20650266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1836 (or 1826 counting only the distinct ones).

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

The square root of 20650266 is about 4544.2563748099. The cubic root of 20650266 is about 274.3522650548.

Adding to 20650266 its reverse (66205602), we get a palindrome (86855868).

The spelling of 20650266 in words is "twenty million, six hundred fifty thousand, two hundred sixty-six".