20266818 has 96 divisors (see below), whose sum is σ = 50595840. Its totient is φ = 5353920.

The previous prime is 20266793. The next prime is 20266837. The reversal of 20266818 is 81866202.

20266818 is nontrivially palindromic in base 12.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 256503 + ... + 256581.

It is an arithmetic number, because the mean of its divisors is an integer number (527040).

Almost surely, 2^20266818 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20266818, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25297920).

20266818 is an abundant number, since it is smaller than the sum of its proper divisors (30329022).

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

20266818 is a wasteful number, since it uses less digits than its factorization.

20266818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144 (or 131 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 33.

The square root of 20266818 is about 4501.8682788371. The cubic root of 20266818 is about 272.6435256599.

The spelling of 20266818 in words is "twenty million, two hundred sixty-six thousand, eight hundred eighteen".