20722226 has 16 divisors (see below), whose sum is σ = 35925120. Its totient is φ = 8780640.

The previous prime is 20722199. The next prime is 20722237. The reversal of 20722226 is 62222702.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 7070 + ... + 9561.

It is an arithmetic number, because the mean of its divisors is an integer number (2245320).

Almost surely, 2^20722226 is an apocalyptic number.

20722226 is a deficient number, since it is larger than the sum of its proper divisors (15202894).

20722226 is a wasteful number, since it uses less digits than its factorization.

20722226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16729.

The product of its (nonzero) digits is 1344, while the sum is 23.

The square root of 20722226 is about 4552.1671761920. The cubic root of 20722226 is about 274.6705741293.

Adding to 20722226 its reverse (62222702), we get a palindrome (82944928).

The spelling of 20722226 in words is "twenty million, seven hundred twenty-two thousand, two hundred twenty-six".