20001222 has 32 divisors (see below), whose sum is σ = 44724960. Its totient is φ = 6625440.

The previous prime is 20001217. The next prime is 20001227. The reversal of 20001222 is 22210002.

It is an interprime number because it is at equal distance from previous prime (20001217) and next prime (20001227).

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20001227) 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 15 ways as a sum of consecutive naturals, for example, 8272 + ... + 10412.

It is an arithmetic number, because the mean of its divisors is an integer number (1397655).

Almost surely, 2^20001222 is an apocalyptic number.

20001222 is an abundant number, since it is smaller than the sum of its proper divisors (24723738).

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

20001222 is a wasteful number, since it uses less digits than its factorization.

20001222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2325 (or 2319 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 9.

The square root of 20001222 is about 4472.2725766661. The cubic root of 20001222 is about 271.4472899108.

Adding to 20001222 its reverse (22210002), we get a palindrome (42211224).

The spelling of 20001222 in words is "twenty million, one thousand, two hundred twenty-two".