20720222 has 16 divisors (see below), whose sum is σ = 33602640. Its totient is φ = 9548928.

The previous prime is 20720221. The next prime is 20720237. The reversal of 20720222 is 22202702.

It is a self number, because there is not a number n which added to its sum of digits gives 20720222.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20720221) by changing a digit.

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, 5963 + ... + 8774.

It is an arithmetic number, because the mean of its divisors is an integer number (2100165).

Almost surely, 2^20720222 is an apocalyptic number.

20720222 is a deficient number, since it is larger than the sum of its proper divisors (12882418).

20720222 is a wasteful number, since it uses less digits than its factorization.

20720222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14795.

The product of its (nonzero) digits is 224, while the sum is 17.

The square root of 20720222 is about 4551.9470559311. The cubic root of 20720222 is about 274.6617195855.

Adding to 20720222 its reverse (22202702), we get a palindrome (42922924).

The spelling of 20720222 in words is "twenty million, seven hundred twenty thousand, two hundred twenty-two".