20681222 has 8 divisors (see below), whose sum is σ = 31682016. Its totient is φ = 10120552.

The previous prime is 20681207. The next prime is 20681233. The reversal of 20681222 is 22218602.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 109913 + ... + 110100.

It is an arithmetic number, because the mean of its divisors is an integer number (3960252).

Almost surely, 2^20681222 is an apocalyptic number.

20681222 is a deficient number, since it is larger than the sum of its proper divisors (11000794).

20681222 is a wasteful number, since it uses less digits than its factorization.

20681222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220062.

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 20681222 is about 4547.6611571224. The cubic root of 20681222 is about 274.4892868327.

Adding to 20681222 its reverse (22218602), we get a palindrome (42899824).

The spelling of 20681222 in words is "twenty million, six hundred eighty-one thousand, two hundred twenty-two".