20731222 has 16 divisors (see below), whose sum is σ = 31648032. Its totient is φ = 10183680.

The previous prime is 20731189. The next prime is 20731231. The reversal of 20731222 is 22213702.

It is a super-2 number, since 2×20731222² = 859567131226568, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20731222.

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, 32022 + ... + 32662.

It is an arithmetic number, because the mean of its divisors is an integer number (1978002).

Almost surely, 2^20731222 is an apocalyptic number.

20731222 is a deficient number, since it is larger than the sum of its proper divisors (10916810).

20731222 is a wasteful number, since it uses less digits than its factorization.

20731222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 903.

The product of its (nonzero) digits is 336, while the sum is 19.

The square root of 20731222 is about 4553.1551697696. The cubic root of 20731222 is about 274.7103153394.

Adding to 20731222 its reverse (22213702), we get a palindrome (42944924).

The spelling of 20731222 in words is "twenty million, seven hundred thirty-one thousand, two hundred twenty-two".