20571222 has 16 divisors (see below), whose sum is σ = 47020032. Its totient is φ = 5877480.

The previous prime is 20571209. The next prime is 20571247. The reversal of 20571222 is 22217502.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (21).

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 7 ways as a sum of consecutive naturals, for example, 244854 + ... + 244937.

It is an arithmetic number, because the mean of its divisors is an integer number (2938752).

Almost surely, 2^20571222 is an apocalyptic number.

20571222 is an abundant number, since it is smaller than the sum of its proper divisors (26448810).

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

20571222 is a wasteful number, since it uses less digits than its factorization.

20571222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 489803.

The product of its (nonzero) digits is 560, while the sum is 21.

The square root of 20571222 is about 4535.5509036941. The cubic root of 20571222 is about 274.0017670868.

Adding to 20571222 its reverse (22217502), we get a palindrome (42788724).

The spelling of 20571222 in words is "twenty million, five hundred seventy-one thousand, two hundred twenty-two".