20266844 has 48 divisors (see below), whose sum is σ = 40901280. Its totient is φ = 8709120.

The previous prime is 20266837. The next prime is 20266847. The reversal of 20266844 is 44866202.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 20266844.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20266847) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 71984 + ... + 72264.

It is an arithmetic number, because the mean of its divisors is an integer number (852110).

Almost surely, 2^20266844 is an apocalyptic number.

It is an amenable number.

20266844 is an abundant number, since it is smaller than the sum of its proper divisors (20634436).

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

20266844 is a wasteful number, since it uses less digits than its factorization.

20266844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 390 (or 388 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 32.

The square root of 20266844 is about 4501.8711665262. The cubic root of 20266844 is about 272.6436422500.

The spelling of 20266844 in words is "twenty million, two hundred sixty-six thousand, eight hundred forty-four".