20221266 has 32 divisors (see below), whose sum is σ = 44573760. Its totient is φ = 6076224.

The previous prime is 20221261. The next prime is 20221273. The reversal of 20221266 is 66212202.

It is not an unprimeable number, because it can be changed into a prime (20221261) 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 15 ways as a sum of consecutive naturals, for example, 340 + ... + 6368.

It is an arithmetic number, because the mean of its divisors is an integer number (1392930).

Almost surely, 2^20221266 is an apocalyptic number.

20221266 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 20221266, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22286880).

20221266 is an abundant number, since it is smaller than the sum of its proper divisors (24352494).

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

20221266 is a wasteful number, since it uses less digits than its factorization.

20221266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6090.

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 20221266 is about 4496.8061999601. The cubic root of 20221266 is about 272.4391065575.

Adding to 20221266 its reverse (66212202), we get a palindrome (86433468).

The spelling of 20221266 in words is "twenty million, two hundred twenty-one thousand, two hundred sixty-six".