20655822 has 16 divisors (see below), whose sum is σ = 45067392. Its totient is φ = 6259320.

The previous prime is 20655773. The next prime is 20655829. The reversal of 20655822 is 22855602.

It is a self number, because there is not a number n which added to its sum of digits gives 20655822.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20655829) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 156418 + ... + 156549.

It is an arithmetic number, because the mean of its divisors is an integer number (2816712).

Almost surely, 2^20655822 is an apocalyptic number.

20655822 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

20655822 is an abundant number, since it is smaller than the sum of its proper divisors (24411570).

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

20655822 is a wasteful number, since it uses less digits than its factorization.

20655822 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 312983.

The product of its (nonzero) digits is 9600, while the sum is 30.

The square root of 20655822 is about 4544.8676548388. The cubic root of 20655822 is about 274.3768678775.

It can be divided in two parts, 2065 and 5822, that added together give a palindrome (7887).

The spelling of 20655822 in words is "twenty million, six hundred fifty-five thousand, eight hundred twenty-two".