20522255 has 16 divisors (see below), whose sum is σ = 26703264. Its totient is φ = 15050880.

The previous prime is 20522251. The next prime is 20522287. The reversal of 20522255 is 55222502.

It is a happy number.

It is not a de Polignac number, because 20522255 - 2² = 20522251 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20522255.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20522251) 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, 9200 + ... + 11210.

It is an arithmetic number, because the mean of its divisors is an integer number (1668954).

Almost surely, 2^20522255 is an apocalyptic number.

20522255 is a deficient number, since it is larger than the sum of its proper divisors (6181009).

20522255 is a wasteful number, since it uses less digits than its factorization.

20522255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2186.

The product of its (nonzero) digits is 2000, while the sum is 23.

The square root of 20522255 is about 4530.1495560301. The cubic root of 20522255 is about 273.7841863577.

Adding to 20522255 its reverse (55222502), we get a palindrome (75744757).

The spelling of 20522255 in words is "twenty million, five hundred twenty-two thousand, two hundred fifty-five".