26563220 has 12 divisors (see below), whose sum is σ = 55782804. Its totient is φ = 10625280.

The previous prime is 26563219. The next prime is 26563223. The reversal of 26563220 is 2236562.

It can be written as a sum of positive squares in 2 ways, for example, as 17825284 + 8737936 = 4222^2 + 2956^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 26563220.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26563223) 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 3 ways as a sum of consecutive naturals, for example, 664061 + ... + 664100.

It is an arithmetic number, because the mean of its divisors is an integer number (4648567).

Almost surely, 2^26563220 is an apocalyptic number.

26563220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

26563220 is an abundant number, since it is smaller than the sum of its proper divisors (29219584).

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

26563220 is a wasteful number, since it uses less digits than its factorization.

26563220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1328170 (or 1328168 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 26.

The square root of 26563220 is about 5153.9518818088. The cubic root of 26563220 is about 298.3734938254.

Adding to 26563220 its reverse (2236562), we get a palindrome (28799782).

The spelling of 26563220 in words is "twenty-six million, five hundred sixty-three thousand, two hundred twenty".